EP0311081A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Displaying method and apparatus for three-dimensional computer graphics
Assignee: Hitachi Ltd
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Filing: 1988-10-06
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Granted: —
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Expires: 2008-10-06
Abstract
Abstract A display apparatus and a modelling method for computer graphics comprises a first memory (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired first number of dimensions, a desired first number of parameters and desired first parametric quantities, an arithmetic unit (1001) for arithmetically determining a second three-dimensional model (4) by varying at least one of the first number of dimensions, the first number of parameters and the first parametric quantities to at least one of a second number of dimensions, a second number of parameters and second parametric quantities in accordance with an algorithm for thereby creating automatically a simplified model (4) for the body of less importance, a second memory (1001) for storing the second three-dimensional model, a selector (1001) for selecting the first three-dimensional model or the second three-dimensional model by reference to a preset index for evaluation, and a display unit (1003) for displaying the first three-dimensional model or the second three-dimensional model as selected.
Inventors
- 👤 Yoshiaki Usami
- 👤 Kenichi Anjyo
- 👤 Yoshimi Oota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 04:20
CPC Classifications
G; G06; G06T; G06T17/00; G06T17/20
Claims Analysis
Total Claims: 55
Claim 1
Independent Claim
84 words
A display apparatus for computer graphics, comprising: (a) memory means (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired number of dimensions, a desired number of parameters and desired parametric quantities; (b) arithmetic means (1001) for arithmetically creating a second three-dimensional model (4) by varying at least one of said number of dimensions, said number of parameters and said parametric quantities; and (c) display means (1003) for displaying at least said second three-dimensional model.
Claim 2
Dependent Claim
84 words
A display apparatus for computer graphics, comprising: (a) memory means (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired number of dimensions, a desired number of parameters and desired parametric quantities; (b) arithmetic means (1001) for arithmetically creating a second three-dimensional model (4) by varying at least one of said number of dimensions, said number of parameters and said parametric quantities; and (c) display means (1003) for displaying at least said second three-dimensional model.
Claim 3
Dependent Claim
41 words
A display apparatus for computer graphics according to claim 1, wherein said arithmetic means creates newly through arithmetic operation said second three-dimensional model by varying at least one of said number of dimensions, said number of parameters and said parametric quantities.
Claim 4
Dependent Claim
38 words
A display apparatus for computer graphics according to claim 1, wherein said first three-dimensional model is constituted by shape data describing the shape of said body to be displayed and mapping data describing the attributes of said body.
Claim 5
Dependent Claim
23 words
A display apparatus for computer graphics according to claim 3, wherein said mapping data include data of transmittance of said body to light.
Claim 6
Dependent Claim
47 words
A display apparatus for computer graphics according to claim 3, wherein said mapping data include normal data representative of a distribution of directions of normals on a surface of said body, further including: means for arithmetically determining color of representation for display by referencing said normal data.
Claim 7
Dependent Claim
48 words
A display apparatus for computer graphics according to claim 5, wherein said mapping data include vertex normal data indicating directions of normals at vertexes of graphic elements, further including: means for arithmetically determining color of representation for display by referencing said normal data and said vertex normal data.
Claim 8
Dependent Claim
84 words
A display apparatus for computer graphics according to claim 1, wherein distance between the three-dimensional model (3; 4) and a visual point (1) is employed as a function for evaluation to be compared with a preset change-over value for changing over a detailed model (3) and a simplified model (4) to each other, further including: means for displaying said detailed model when said distance is smaller than said preset value, while displaying said simplified model when said distance is greater than said preset values.
Claim 9
Dependent Claim
112 words
A display apparatus for computer graphics, comprising: (a) memory means (1001) for storing a first three-dimensional model of a body (3) represented by at least one of a desired number of dimensions, a desired number of parameters and desired parametric quantities; (b) arithmetic means (1001) for arithmetically creating a second three-dimensional model (4) by varying at least one of said number of dimensions, said number of parameters and said parametric quantities; (c) selecting means (1001) for selecting said first three-dimensional model or said second three-dimensional model by reference to a preset index for evaluation; and (d) display means (1003) for displaying said first three-dimensional model or said second three-dimensional model as selected.
Claim 10
Dependent Claim
112 words
A display apparatus for computer graphics, comprising: (a) memory means (1001) for storing a first three-dimensional model of a body (3) represented by at least one of a desired number of dimensions, a desired number of parameters and desired parametric quantities; (b) arithmetic means (1001) for arithmetically creating a second three-dimensional model (4) by varying at least one of said number of dimensions, said number of parameters and said parametric quantities; (c) selecting means (1001) for selecting said first three-dimensional model or said second three-dimensional model by reference to a preset index for evaluation; and (d) display means (1003) for displaying said first three-dimensional model or said second three-dimensional model as selected.
Claim 11
Dependent Claim
41 words
A display apparatus for computer graphics according to claim 8, wherein said arithmetic means creates newly through arithmetic operation the second three-dimensional model by varying at least one of said number of dimensions, said number of parameters and said parametric quantities.
Claim 12
Dependent Claim
38 words
A display apparatus for computer graphics according to claim 8, wherein said first three-dimensional model is constituted by shape data describing the shape of said body to be displayed and mapping data describing the attributes of said body.
Claim 13
Dependent Claim
23 words
A display apparatus for computer graphics according to claim 10, wherein said mapping data include data of transmittance of said body to light.
Claim 14
Dependent Claim
47 words
A display apparatus for computer graphics according to claim 10, wherein said mapping data include normal data representative of a distribution of directions of normals on a surface of said body, further including: means for arithmetically determining color of representation for display by referencing said normal data.
Claim 15
Dependent Claim
48 words
A display apparatus for computer graphics according to claim 12, wherein said mapping data include vertex normal data indicating directions of normals at vertexes of graphic elements, further including: means for arithmetically determining color of representation for display by referencing said normal data and said vertex normal data.
Claim 16
Dependent Claim
84 words
A display apparatus for computer graphics according to claim 8, wherein distance between the three-dimensional model (3; 4) and a visual point (1) is employed as a function for evaluation to be compared with a preset change-over value for changing over a detailed model (3) and a simplified model (4) to each other, further including: means for displaying said detailed model when said distance is smaller than said preset value, while displaying said simplified model when said distance is greater than said preset values.
Claim 17
Dependent Claim
147 words
A display apparatus for computer graphics, comprising: (a) first memory means (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired first number of dimensions, a desired first number of parameters and desired first parametric quantities; (b) arithmetic means for creating a second three-dimensional model (4) by varying at least one of said first number of dimensions, said first number of parameters and said first parametric quantities to at least one of a second number of dimensions, a second number of parameters and second parametric quantities; (c) second memory means (1001) for storing said second three-dimensional model; (d) selecting means (1001) for selecting said first three-dimensional model or said second three-dimensional model by reference to a preset index for evaluation; and (e) display means (1003) for displaying said first three-dimensional model or said second three-dimensional model as selected.
Claim 18
Dependent Claim
147 words
A display apparatus for computer graphics, comprising: (a) first memory means (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired first number of dimensions, a desired first number of parameters and desired first parametric quantities; (b) arithmetic means for creating a second three-dimensional model (4) by varying at least one of said first number of dimensions, said first number of parameters and said first parametric quantities to at least one of a second number of dimensions, a second number of parameters and second parametric quantities; (c) second memory means (1001) for storing said second three-dimensional model; (d) selecting means (1001) for selecting said first three-dimensional model or said second three-dimensional model by reference to a preset index for evaluation; and (e) display means (1003) for displaying said first three-dimensional model or said second three-dimensional model as selected.
Claim 19
Dependent Claim
60 words
A display apparatus for computer graphics according to claim 15, wherein said arithmetic means creates arithmetically said second three-dimensional model by decreasing at least one of said first number of dimensions, said first number of parameters and said first parametric quantities to at least one of a second number of dimensions, a second number of parameters and second parametric quantities.
Claim 20
Dependent Claim
38 words
A display apparatus for computer graphics according to claim 15, wherein said first three-dimensional model is constituted by shape data describing the shape of said body to be displayed and mapping data describing the attributes of said body.
Claim 21
Dependent Claim
23 words
A display apparatus for computer graphics according to claim 17, wherein said mapping data include data of transmittance of said body to light.
Claim 22
Dependent Claim
46 words
A display apparatus for computer graphics according to claim 17, wherein said mapping data include normal data indicating a distribution of directions of normals on a surface of said body, further including: means for arithmetically determining color of representation for display by referencing said normal data.
Claim 23
Dependent Claim
48 words
A display apparatus for computer graphics according to claim 19, wherein said mapping data include vertex normal data indicating directions of normals at vertexes of graphic elements, further including: means for arithmetically determining color of representation for display by referencing said normal data and said vertex normal data.
Claim 24
Dependent Claim
85 words
A display apparatus for computer graphics according to claim 15, wherein distance between the three dimensional model (3; 4) and a visual point (1) is employed as a function for evaluation to be compared with a preset change-over value for changing over a detailed model (3) and a simplified model (4) to each other, further including: means for displaying said detailed model when said distance is smaller than said preset value, while displaying said simplified model when said distance is greater than said preset values.
Claim 25
Dependent Claim
205 words
A display apparatus for computer graphics, comprising: (a) first memory means (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired first number of dimensions, a desired first number of parameters and desired first parametric quantities; (b) second memory means (1001) for storing a second three-dimensional model (4) of said body represented by at least one of a second number of dimensions, a second number of parameters and second parametric quantities which differs from at least one of said first number of dimensions, said first number of parameters and said first parametric quantities; (c) arithmetic means (1001) for creating a third three-dimensional model of said body represented by at least one of a third number of dimensions, a third number of parameters and third parametric quantities through arithmetic operation in accordance with correlation existing between said first three-dimensional model and said second three-dimensional model; (d) selecting means (1001) for selecting one of said first three-dimensional model, said second three- dimensional model and said third three-dimensional model by reference to a preset index for evaluation; and (e) display means (1003) for displaying said first three-dimensional model, said second three-dimensional model or said third three-dimensional model as selected.
Claim 26
Dependent Claim
205 words
A display apparatus for computer graphics, comprising: (a) first memory means (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired first number of dimensions, a desired first number of parameters and desired first parametric quantities; (b) second memory means (1001) for storing a second three-dimensional model (4) of said body represented by at least one of a second number of dimensions, a second number of parameters and second parametric quantities which differs from at least one of said first number of dimensions, said first number of parameters and said first parametric quantities; (c) arithmetic means (1001) for creating a third three-dimensional model of said body represented by at least one of a third number of dimensions, a third number of parameters and third parametric quantities through arithmetic operation in accordance with correlation existing between said first three-dimensional model and said second three-dimensional model; (d) selecting means (1001) for selecting one of said first three-dimensional model, said second three- dimensional model and said third three-dimensional model by reference to a preset index for evaluation; and (e) display means (1003) for displaying said first three-dimensional model, said second three-dimensional model or said third three-dimensional model as selected.
Claim 27
Dependent Claim
102 words
A display apparatus for computer graphics according to claim 22, wherein said arithmetic means creates arithmetically said third three-dimensional model in accordance with correlation existing between said first three-dimensional model and said second three-dimensional model, said third three-dimensional model being represented by at least one of a third number of dimensions, a third number of parameters and third parametric quantities which lies between at least one of said first number of dimensions, said first number of parameters and said first parametric quantities and at least one of said second number of dimensions, said second number of parameters and said second parametric quantities.
Claim 28
Dependent Claim
103 words
A display apparatus for computer graphics according to claim 22, wherein said arithmetic means creates arithmetically said third three-dimensional model in accordance with correlation existing between said first three-dimensional model and said second three-dimensional model, said third three-dimensional model being represented by at least one of a third number of dimensions, a third number of parameters and third parametric quantities which is smaller than at least one of said first number of dimensions, said first number of parameters and said first parametric quantities and at least one of said second number of dimensions, said second number of parameters and said second parametric quantities.
Claim 29
Dependent Claim
38 words
A display apparatus for computer graphics according to claim 22, wherein said first three-dimensional model is constituted by shape data describing the shape of said body to be displayed and mapping data describing the attributes of said body.
Claim 30
Dependent Claim
23 words
A display apparatus for computer graphics according to claim 25, wherein said mapping data include data of transmittance of said body to light.
Claim 31
Dependent Claim
46 words
A display apparatus for computer graphics according to claim 25, wherein said mapping data include normal data indicating a distribution of directions of normals on a surface of said body, further including: means for arithmetically determining color of representation for display by referencing said normal data.
Claim 32
Dependent Claim
48 words
A display apparatus for computer graphics according to claim 27, wherein said mapping data include vertex normal data indicating directions of normals at vertexes of figure elements, further including: means for arithmetically determining color of representation for display by referencing said normal data and said vertex normal data.
Claim 33
Dependent Claim
84 words
A display apparatus for computer graphics according to claim 22, wherein distance between the three-dimensional model (3; 4) and a visual point (1) is employed as a function for evaluation to be compared with a preset change-over value for changing over a detailed model (3) and a simplified model (4) to each other, further including: means for displaying said detailed model when said distance is smaller than said preset value, while displaying said simplified model when said distance is greater than said preset values.
Claim 34
Dependent Claim
210 words
A display apparatus for computer graphics, comprising: (a) first memory means (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired first number of dimensions, a desired first number of parameters and desired first parametric quantities; (b) first arithmetic means (1001) for creating a second three-dimensional model by varying at least one of said first number of dimensions, said first number of parameters and said first parametric quantities to at least one of a second number of dimensions, a second number of parameters and second parametric quantities; (c) second memory means (1001) for storing said second three-dimensional model; (d) second arithmetic means (1001) for creating a third three-dimensional model of said body represented by at least one of a third number of dimensions, a third number of parameters and third parametric quantities through arithmetic operation in accordance with correlation existing between said first three-dimensional model and said second three-dimensional model; (e) selecting means (1001) for selecting one of said first three-dimensional model, said second three-dimensional model and said third three-dimensional model by reference to a preset index for evaluation; and (f) display means (1003) for displaying said first three-dimensional model, said second three-dimensional model or said third three-dimensional model as selected.
Claim 35
Dependent Claim
210 words
A display apparatus for computer graphics, comprising: (a) first memory means (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired first number of dimensions, a desired first number of parameters and desired first parametric quantities; (b) first arithmetic means (1001) for creating a second three-dimensional model by varying at least one of said first number of dimensions, said first number of parameters and said first parametric quantities to at least one of a second number of dimensions, a second number of parameters and second parametric quantities; (c) second memory means (1001) for storing said second three-dimensional model; (d) second arithmetic means (1001) for creating a third three-dimensional model of said body represented by at least one of a third number of dimensions, a third number of parameters and third parametric quantities through arithmetic operation in accordance with correlation existing between said first three-dimensional model and said second three-dimensional model; (e) selecting means (1001) for selecting one of said first three-dimensional model, said second three-dimensional model and said third three-dimensional model by reference to a preset index for evaluation; and (f) display means (1003) for displaying said first three-dimensional model, said second three-dimensional model or said third three-dimensional model as selected.
Claim 36
Dependent Claim
61 words
A display apparatus for computer graphics according to claim 30, wherein said first arithmetic means creates arithmetically said second three-dimensional model by decreasing at least one of said first number of dimensions, said first number of parameters and said first parametric quantities to at least one of a second number of dimensions, a second number of parameters and second parametric quantities.
Claim 37
Dependent Claim
103 words
A display apparatus for computer graphics according to claim 30, wherein said second arithmetic means creates arithmetically said third three-dimensional model in accordance with correlation existing between said first three-dimensional model and said second three-dimensional model, said third three-dimensional model being represented by at least one of a third number of dimensions, a third number of parameters and third parametric quantities which lies between at least one of said first number of dimensions, said first number of parameters and said first parametric quantities and at least one of said second number of dimensions, said second number of parameters and said second parametric quantities.
Claim 38
Dependent Claim
104 words
A display apparatus for computer graphics according to claim 30, wherein said second arithmetic means creates arithmetically said third three-dimensional model in accordance with correlation existing between said first three-dimensional model and said second three-dimensional model, said third three-dimensional model being represented by at least one of a third number of dimensions, a third number of parameters and third parametric quantities which is smaller than at least one of said first number of dimensions, said first number of parameters and said first parametric quantities and at least one of said second number of dimensions, said second number of parameters and said second parametric quantities.
Claim 39
Dependent Claim
38 words
A display apparatus for computer graphics according to claim 30, wherein said first three-dimensional model is constituted by shape data describing the shape of said body to be displayed and mapping data describing the attributes of said body.
Claim 40
Dependent Claim
23 words
A display apparatus for computer graphics according to claim 34, wherein said mapping data include data of transmittance of said body to light.
Claim 41
Dependent Claim
47 words
A display apparatus for computer graphics according to claim 34, wherein said mapping data include normal data representative of a distribution of directions of normals on a surface of said body, further including: means for arithmetically determining color of representation for display by referencing said normal data.
Claim 42
Dependent Claim
48 words
A display apparatus for computer graphics according to claim 36, wherein said mapping data include vertex normal data indicating directions of normals at vertexes of graphic elements, further including: means for arithmetically determining color of representation for display by referencing said normal data and said vertex normal data.
Claim 43
Dependent Claim
79 words
A display apparatus for computer graphics according to claim 30, wherein distance between the three-dimensional model and a visual point is employed as a function for evaluation to be compared with a preset change-over value for changing over the detailed model and the simplified model to each other, further including: means for displaying said detailed model when said distance is smaller than said preset value, while displaying said simplified model when said distance is greater than said preset values.
Claim 44
Dependent Claim
150 words
A display apparatus for computer graphics, comprising: (a) first memory means (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired first number of dimensions, a desired first number of parameters and desired first parametric quantities; (b) second memory means (1001) for storing a second three-dimensional model (4) of said body represented by at least one of a second number of dimensions, a second number of parameters and second parametric quantities which differs from at least one of said first number of dimensions, said first number of parameters and said first parametric quantities; (c) selecting means (1001) for selecting one of said first three-dimensional model or said second three-dimensional model by reference to a moving speed of said body serving as a function for evaluation; and (d) display means (1003) for displaying said first three-dimensional model or said second three-dimensional model.
Claim 45
Dependent Claim
150 words
A display apparatus for computer graphics, comprising: (a) first memory means (1001) for storing a first three-dimensional model (3) of a body represented by at least one of a desired first number of dimensions, a desired first number of parameters and desired first parametric quantities; (b) second memory means (1001) for storing a second three-dimensional model (4) of said body represented by at least one of a second number of dimensions, a second number of parameters and second parametric quantities which differs from at least one of said first number of dimensions, said first number of parameters and said first parametric quantities; (c) selecting means (1001) for selecting one of said first three-dimensional model or said second three-dimensional model by reference to a moving speed of said body serving as a function for evaluation; and (d) display means (1003) for displaying said first three-dimensional model or said second three-dimensional model.
Claim 46
Dependent Claim
52 words
A display apparatus for computer graphics according to claim 39, wherein at least one of said second number of dimensions, said second number of parameters and said second parametric quantities is smaller than at least one of said first number of dimensions, said first number of parameters and said first parametric quantities.
Claim 47
Dependent Claim
38 words
A display apparatus for computer graphics according to claim 39, wherein said first three-dimensional model is constituted by shape data describing the shape of said body to be displayed and mapping data describing the attributes of said body.
Claim 48
Dependent Claim
23 words
A display apparatus for computer graphics according to claim 41, wherein said mapping data include data of transmittance of said body to light.
Claim 49
Dependent Claim
46 words
A display apparatus for computer graphics according to claim 41, wherein said mapping data include normal data representing a distribution of directions of normals or a surface of said body, further including: means for arithmetically determining color of representation for display by referencing said normal data.
Claim 50
Dependent Claim
48 words
A display apparatus for computer graphics according to claim 43, wherein said mapping data include vertex normal data indicating directions of normals at vertexes of graphic elements, further including: means for arithmetically determining color of representation for display by referencing said normal data and said vertex normal data.
Claim 51
Dependent Claim
82 words
A display apparatus for computer graphics according to claim 39, wherein distance between the three-dimensional model and a visual point (1) is employed as a function for evaluation to be compared with a preset change-over value for changing over a detailed model (3) and a simplified model (4) to each other, further including: means for displaying said detailed model when said distance is smaller than said preset value, while displaying said simplified model when said distance is greater than said preset values.
Claim 52
Independent Claim
146 words
A method of creating data to be displayed for computer graphics, comprising steps of: (a) creating data representing a first three-dimensional model of a body to be displayed which is constituted by at least one of a desired number of dimensions, a desired number of parameters and desired parametric quantities; (b) creating arithmetically data of a second three-dimensional model by altering at least one of said number of dimensions, said number of parameters and said parametric quantities constituting said three-dimensional model represented by said data created at said step (a) in accordance with weight put on said body in the display; and (c) processing at least one of said data representing said first three-dimensional model and said second three-dimensional model created at the steps (a) and (b), respectively, so that data for representation of at least one of said models to be displayed can be obtained.
Claim 53
Independent Claim
146 words
A method of creating data to be displayed for computer graphics, comprising steps of: (a) creating data representing a first three-dimensional model of a body to be displayed which is constituted by at least one of a desired number of dimensions, a desired number of parameters and desired parametric quantities; (b) creating arithmetically data of a second three-dimensional model by altering at least one of said number of dimensions, said number of parameters and said parametric quantities constituting said three-dimensional model represented by said data created at said step (a) in accordance with weight put on said body in the display; and (c) processing at least one of said data representing said first three-dimensional model and said second three-dimensional model created at the steps (a) and (b), respectively, so that data for representation of at least one of said models to be displayed can be obtained.
Claim 54
Dependent Claim
78 words
A method according to claim 46, wherein said first three-dimensional model has a weight for the display which represents a degree of detail of said body, further including: a step of creating a simplified model constituting said second three-dimensional model through arithmetic operation for decreasing at least one of said number of dimensions, said number of parameters and said parametric quantities representing said first three-dimensional model in accordance with lower positional weight of said body to be displayed.
Claim 55
Dependent Claim
42 words
A method according to claim 46, wherein said weight in the display is determined in dependence on at least one of perspectival position of said body in a scene to be displayed and a proportion which said body occupies in said scene.
References Cited (Backward Citations)
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