JPH01106179A - Display device for projection image of three-dimensional shape - Google Patents

Abstract

PURPOSE:To change the projecting direction of a 3-dimensional shape through the change of a 2-dimensional position by using horizontal and vertical rotational angle memory means to store rotational angles related to two axes set in the vertical and horizontal directions of a 3-dimensional shape on a picture. CONSTITUTION:A horizontal rotational angle memory means 101 stores the rotational angles having their rotational axes set in the vertical direction 301 of a 3-dimensional shape itself. Thus it is possible to obtain information showing a specific side surface of a 3-dimensional shape 305 that should be turned to a picture in terms of a projection image via a rotating operation 302. While a vertical rotational angle memory means 102 stores the rotational angles having their rotational axes set in the horizontal direction 303 of the picture. Thus it is possible to obtain the information showing a specific degree of tilt to be set for the shape 305 against the picture via a rotating operation 304 in terms of the projection image. Thus it is possible to obtain an image from an optional projecting direction of the shape 305 itself with combination of two operations 302 and 304.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a three-dimensional projection image display device that allows the projection direction to be changed interactively.

(Prior Art) In order to change the projection direction in a three-dimensional projection image display device, conventionally, as shown in FIG.
9 screen vertical direction 202. Then, the three-dimensional shape 204 is rotated about a total of three axes including the screen front-rear direction 203 perpendicular to the screen.

(Problems to be Solved by the Invention) However, in this method, since the projection direction is changed by rotation about three axes, three parameters have to be changed at the same time, making the operation difficult. Further, while rotating the shape, the projected image 403 often became tilted with respect to the vertical direction 404 of the screen, as shown in FIG. 4(b).

In applications such as product design, it is difficult to perform interactive operations with the projected image tilted, and therefore, each time the projected image is tilted, it is necessary to correct the tilt by rotating the shape in the front-rear direction 402 of the screen. Ta.

The purpose of the present invention is to solve these problems, and to provide a three-dimensional shape in which the projection direction can be changed with fewer operations without causing a situation in which the projected image of the three-dimensional shape is tilted with respect to the top and bottom of the screen. An object of the present invention is to provide a projection image display device.

(Means for Solving the Problems) The three-dimensional shape projection image display device of the present invention has a lateral rotation angle that stores the rotation angle of the three-dimensional shape with the vertical direction of the three-dimensional shape itself as the rotation axis. a storage means, a vertical rotation angle storage means for storing a rotation angle of a three-dimensional shape with the horizontal direction of the screen as a rotation axis, a displacement input means for inputting a two-dimensional position change amount, and a displacement input means for inputting a two-dimensional position change amount; rotation angle changing means for changing the contents of the horizontal rotation angle storage means and the vertical rotation angle storage means by output; a shape data storage means for storing shape data of a three-dimensional shape; and the horizontal rotation angle storage means. and rotation conversion means for rotationally converting the shape data stored in the shape data storage means according to the contents of the vertical rotation angle storage means, and rotation conversion according to the output of the rotation conversion means and the contents of the shape data storage means. The calibration can be performed using a projection display means that displays a projected image of the determined three-dimensional shape on a display screen.

(effect) FIG. 1 is a block diagram showing the overall configuration of the present invention.

In FIG. 1, reference numeral 101 denotes a lateral rotation angle storage means for storing the rotation angle of a three-dimensional shape whose rotation axis is the vertical direction of the three-dimensional shape itself.

Reference numeral 102 denotes a vertical rotation angle storage means for storing the rotation angle of a three-dimensional shape with the horizontal direction of the screen as the rotation axis.

Reference numeral 103 denotes a displacement input means for inputting a two-dimensional positional change amount.

Reference numeral 104 denotes a rotation angle changing means for changing the rotation angles of the horizontal rotation angle storage means 1α1 and the vertical rotation angle storage means 102 in accordance with the amount of change in two-dimensional position.

105 is a shape data storage means for storing shape data of a three-dimensional shape.

Reference numeral 106 denotes a rotation conversion means for rotationally converting the shape data of the three-dimensional shape using the vertical direction of the three-dimensional shape itself and the horizontal direction of the screen according to the rotation angles of the horizontal rotation angle storage means 101 and the vertical rotation angle storage means 102. be.

Reference numeral 107 denotes a projection display means for projecting the shape data of the three-dimensional shape that has undergone rotational transformation onto the display screen 108 and displaying it as a projected image of the three-dimensional shape.

In the lateral rotation angle storage means 101, as shown in FIG.
A rotation angle with the vertical direction 301 of the dimensional shape itself as the rotation axis is stored. This provides information as to which side of the three-dimensional shape 305 should be directed toward the screen as a projected image by the rotation operation 302.

The vertical rotation angle storage means 102 stores rotation angles with the screen horizontal direction 303 as the rotation axis. This provides information on how much the three-dimensional shape 305 is tilted as a projected image with respect to the screen by the rotation operation 304. 302
By combining the rotation operations 304 and 304, a projected image of the three-dimensional shape itself 305 from any projection direction can be obtained.

In the conventional technology, horizontal rotation was performed using the vertical direction of the screen as the rotation axis. Therefore, when a three-dimensional shape 401 that is inclined with respect to the screen as shown in FIG.
4, and the projected image 403 is tilted with respect to the top and bottom of the screen as shown in FIG.

However, in the present invention, the horizontal rotation is performed in the vertical direction 40
5, the projected image 406 is always maintained without being tilted with respect to the top and bottom of the screen, as shown in FIG. 4(C). Therefore, there is no need to rotate the screen in the front-rear direction 402, and an intended projected image can be obtained only by rotating the screen around two axes: the vertical direction of the shape and the horizontal direction of the screen.

In the device configuration of the present invention, the rotation angle with respect to two axes, the vertical direction of the shape and the horizontal direction of the screen, is stored in the horizontal rotation angle storage means 101.
is stored in the vertical rotation angle storage means 102, and when changing the projection direction, this rotation angle is increased or decreased by a two-dimensional position change operation via the displacement input means 103 and the rotation angle change means 104. ing.

As described above, according to the device configuration of the present invention, the projection direction can be changed by simply changing the two-dimensional position, and the projected image is always maintained without being tilted in the vertical direction of the screen. It can be obtained with

(Example) FIG. 5 is a block diagram showing one embodiment of the present invention.

In FIG. 5, 501 is a two-dimensional coordinate input device such as a mouse or a tablet, which inputs two-dimensional positional changes ΔX and Δy from the operator's hand movements.

502 is an arithmetic circuit that converts the value of the lateral displacement amount ΔX into the change amount ΔS of the lateral rotation angle.

503 is an arithmetic circuit that converts the value of the vertical displacement amount Δy into the vertical rotation angle change amount Δθ.

504 is a lateral rotation angle register that stores the lateral rotation angle S.

505 is a vertical rotation angle register that stores the vertical rotation angle θ.

506 is an addition/subtraction circuit that adds the amount of change ΔS in the lateral rotation angle to the lateral rotation angle register 504.

507 is an addition/subtraction circuit that adds the amount of change Δθ of the vertical rotation angle to the vertical rotation angle register 505.

508 is a vertex data memory that stores three-dimensional coordinates of all vertices of a three-dimensional shape.

509 is a reading circuit that reads the three-dimensional coordinates (Xa + Ya + Zo) of one vertex from the vertex data memory 508.

510 is the three-dimensional coordinate of the vertex (xo + 70 + 26
) is rotated by a lateral rotation angle S with respect to the vertical rotation axis of the 3D shape, and the 3D coordinate intermediate data (X,.

y, zI).

511 is three-dimensional coordinate intermediate data (Xl*'!r y
Zt) is the vertical rotation angle θ with respect to the horizontal rotation axis of the screen.
Rotate and transform the 3D coordinate final data (Xt + 7
This is a rotation conversion calculation circuit that generates *1zt).

512 is the three-dimensional coordinate final data Oh + yx t Z
t) is subjected to perspective projection transformation or parallel projection transformation to generate two-dimensional screen coordinates (xs, yi) of vertices.

513 is a vertex data memory that stores two-dimensional screen coordinates of all vertices.

A writing circuit 514 writes the two-dimensional screen coordinates (xl, ys) of one vertex into the vertex data memory 513.

515 is an edge line data memory that stores pointers to the vertices at both ends of all edges of a three-dimensional shape.

Reference numeral 516 denotes a read circuit that reads pointers pt and p2 to the vertices at both ends of one edge line from the edge line data memory 515.

517 searches the vertex data memory 513 from the two vertex pointers pi and p2, and calculates the two-dimensional screen coordinates (x
++-)'++), (Xxx + Yet).

518 is the two-dimensional screen coordinates of the two vertices (X1++yll
) and (Xzx r Ytt ), this is a line segment drawing circuit that draws a line segment connecting the two on the display screen.

In the three-dimensional projection image display device configured as described above, the operation when the operator performs an operation to instruct a change in the projection direction will be described.

■ Two-dimensional position change amount Δ from the two-dimensional coordinate input device 501
X and Δy are output.

(2) Arithmetic circuits 502 and 503 calculate the two-dimensional positional change amount ΔX.

Δy is converted into a change amount ΔS in the horizontal rotation angle and a change amount Δθ in the vertical rotation angle. At this time, Δ8 is a constant times ΔX, Δθ
is a constant times Δy. However, the vertical rotation angle θ is 18
It is also conceivable to invert the sign of ΔS when the angle is between 0° and 3600°. This is to prevent the rotation direction in horizontal rotation from giving a sense of discomfort to the operation when the three-dimensional shape is upside down on the screen.

■ Addition/subtraction circuits 506 and 507 add the change amount ΔS in the horizontal rotation angle and the change amount Δθ in the vertical rotation angle to the horizontal rotation angle register 504 and the vertical rotation angle register, and write a new horizontal rotation angle on the register. 8 and the vertical rotation angle θ.

(2) The readout circuit 509 sequentially reads the three-dimensional coordinates (XI + yolzo) of all vertices from the vertex data memory.

■The rotation conversion calculation circuit 510 uses the three-dimensional coordinates of the vertices (X +
y@gza) with respect to the vertical rotation axis of the three-dimensional shape
The three-dimensional coordinate intermediate data (xl,
yI l z, ) is generated. At this time, if the vertical direction of the three-dimensional shape is taken as the y axis, the coordinate transformation formula is as follows.

■The rotation conversion calculation circuit 511 rotationally transforms the three-dimensional coordinate intermediate data (XI, yI, zl) of the vertex by θ about the horizontal rotation axis of the screen to obtain the final three-dimensional coordinate data of the vertex (X
I + Yt I z, ) is generated. At this time, if the horizontal direction of the screen is taken as the X axis, the coordinate conversion formula is as follows.

■The projection calculation circuit 512 uses the final three-dimensional coordinate data of the vertices (
XI! 71 + zt) is subjected to perspective projection transformation or parallel projection transformation to obtain the two-dimensional screen coordinates of the vertex (xs + 7
x).

(2) The writing circuit 514 sequentially writes the two-dimensional screen coordinates (xs, 7n) of the obtained vertices into the vertex data memory 513 for all vertices.

(2) The reading circuit 516 sequentially reads out the vertex pointers pt and p2 at both ends of all edges from the edge data memory 515. The vertex pointer points to one in the list of two-dimensional screen coordinates (xx, yo) of vertices in the vertex data memory 513.

■The readout circuit 517 reads the two-dimensional screen coordinates (X+++'/+
+) and the two-dimensional screen coordinates (Xxx
, Vtx).

■The line segment drawing circuit 518 uses the two-dimensional screen coordinates (X++
+7++), (Xxx, 7zt)(') The line segments connecting both ends are drawn on the display screen in order, and a three-dimensional wire frame projected image is completed on the display screen.

(Effects of the Invention) As is clear from the above description, according to the present invention, the projection direction of a three-dimensional shape can be changed with a small operation of changing the two-dimensional position, and the projected image can be obtained as intended without being tilted. Therefore, in applications where a three-dimensional shape model is displayed on a display screen and interactive processing is performed, the projection image can be efficiently switched by changing the projection direction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of the present invention, FIG. 2 is a diagram showing the operation of the prior art, FIG. 3 is a diagram showing the operation of the present invention, and FIG. 4 is a diagram showing the differences between the prior art and the present invention. FIG. 5 is a block diagram showing an embodiment of the present invention, which is a diagram illustrating the difference in effects regarding the tilt of the projected image.

Claims (1)

[Scope of Claims] Horizontal rotation angle storage means for storing a rotation angle of a three-dimensional shape with the vertical direction of the three-dimensional shape itself as the rotation axis; and rotation of the three-dimensional shape with the horizontal direction of the screen as the rotation axis. a vertical rotation angle storage means for storing a rotation angle of the rotation angle; a displacement input means for inputting a two-dimensional positional change amount; and an output of the displacement input means to store the horizontal rotation angle storage means and the vertical rotation angle storage means. rotation angle changing means for changing the contents of the shape data; shape data storage means for storing shape data of a three-dimensional shape; and shape data storage means for changing the contents of the horizontal rotation angle storage means and the vertical rotation angle storage means. rotation conversion means for rotationally converting stored shape data; and projection display means for displaying on a display screen a projected image of a three-dimensional shape rotationally transformed based on the output of the rotation conversion means and the contents of the shape data storage means. A three-dimensional projection image display device comprising: