问题
I'm displaying a scene with some cubes in it. The camera uses persective. Everything works great, but I'd like the vertical lines to be parallel (two point perspective: http://en.wikipedia.org/wiki/Perspective_(graphical)#Two-point_perspective).
When viewing a cube from the front:
What I want:
+-----+
| |
| |
+-----+
What I'm getting (exaggerated):
+--------+
\ /
\ /
+--+
I've tried fiddling with the camera's FOV, but to no avail.
My attempt so far:
Camera = SceneManager.CreateCamera(CameraName);
float q = 45;
float d = 5000f;
Matrix4 m = new Matrix4(
1, 0, 0, (float)(Math.Sin(q)/d),
0, 1, 0, 0,
0, 0, 1, (float)(Math.Cos(q)/d),
0, 0, 0, 0
);
Camera.SetCustomProjectionMatrix(true, m);
回答1:
The University of Berkeley has a page on the different perspective transformations and the matrices you need to use. The two-point perspective transformation is:
_ _
| 1 0 0 sin(q)/d |
| 0 1 0 0 |
| 0 0 1 cos(q)/d |
|_ 0 0 0 0 _|
Where q is the angle used to rotate the points (rather than the axes) and d is unexplained(!) but I think it's the distance of the camera from the focal plane.
Source
来源：https://stackoverflow.com/questions/10869603/ogre-mogre-camera-two-point-perspective