Off center projection
- by N0xus
I'm trying to implement the code that was freely given by a very kind developer at the following link:
http://forum.unity3d.com/threads/142383-Code-sample-Off-Center-Projection-Code-for-VR-CAVE-or-just-for-fun
Right now, all I'm trying to do is bring it in on one camera, but I have a few issues. My class, looks as follows:
using UnityEngine;
using System.Collections;
public class PerspectiveOffCenter : MonoBehaviour
{
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
}
public static Matrix4x4 GeneralizedPerspectiveProjection(Vector3 pa, Vector3 pb, Vector3 pc, Vector3 pe, float near, float far)
{
Vector3 va, vb, vc;
Vector3 vr, vu, vn;
float left, right, bottom, top, eyedistance;
Matrix4x4 transformMatrix;
Matrix4x4 projectionM;
Matrix4x4 eyeTranslateM;
Matrix4x4 finalProjection;
///Calculate the orthonormal for the screen (the screen coordinate system
vr = pb - pa;
vr.Normalize();
vu = pc - pa;
vu.Normalize();
vn = Vector3.Cross(vr, vu);
vn.Normalize();
//Calculate the vector from eye (pe) to screen corners (pa, pb, pc)
va = pa-pe;
vb = pb-pe;
vc = pc-pe;
//Get the distance;; from the eye to the screen plane
eyedistance = -(Vector3.Dot(va, vn));
//Get the varaibles for the off center projection
left = (Vector3.Dot(vr, va)*near)/eyedistance;
right = (Vector3.Dot(vr, vb)*near)/eyedistance;
bottom = (Vector3.Dot(vu, va)*near)/eyedistance;
top = (Vector3.Dot(vu, vc)*near)/eyedistance;
//Get this projection
projectionM = PerspectiveOffCenter(left, right, bottom, top, near, far);
//Fill in the transform matrix
transformMatrix = new Matrix4x4();
transformMatrix[0, 0] = vr.x;
transformMatrix[0, 1] = vr.y;
transformMatrix[0, 2] = vr.z;
transformMatrix[0, 3] = 0;
transformMatrix[1, 0] = vu.x;
transformMatrix[1, 1] = vu.y;
transformMatrix[1, 2] = vu.z;
transformMatrix[1, 3] = 0;
transformMatrix[2, 0] = vn.x;
transformMatrix[2, 1] = vn.y;
transformMatrix[2, 2] = vn.z;
transformMatrix[2, 3] = 0;
transformMatrix[3, 0] = 0;
transformMatrix[3, 1] = 0;
transformMatrix[3, 2] = 0;
transformMatrix[3, 3] = 1;
//Now for the eye transform
eyeTranslateM = new Matrix4x4();
eyeTranslateM[0, 0] = 1;
eyeTranslateM[0, 1] = 0;
eyeTranslateM[0, 2] = 0;
eyeTranslateM[0, 3] = -pe.x;
eyeTranslateM[1, 0] = 0;
eyeTranslateM[1, 1] = 1;
eyeTranslateM[1, 2] = 0;
eyeTranslateM[1, 3] = -pe.y;
eyeTranslateM[2, 0] = 0;
eyeTranslateM[2, 1] = 0;
eyeTranslateM[2, 2] = 1;
eyeTranslateM[2, 3] = -pe.z;
eyeTranslateM[3, 0] = 0;
eyeTranslateM[3, 1] = 0;
eyeTranslateM[3, 2] = 0;
eyeTranslateM[3, 3] = 1f;
//Multiply all together
finalProjection = new Matrix4x4();
finalProjection = Matrix4x4.identity * projectionM*transformMatrix*eyeTranslateM;
//finally return
return finalProjection;
}
// Update is called once per frame
public void FixedUpdate ()
{
Camera cam = camera;
//calculate projection
Matrix4x4 genProjection = GeneralizedPerspectiveProjection( new Vector3(0,1,0), new Vector3(1,1,0), new Vector3(0,0,0), new Vector3(0,0,0), cam.nearClipPlane, cam.farClipPlane);
//(BottomLeftCorner, BottomRightCorner, TopLeftCorner, trackerPosition, cam.nearClipPlane, cam.farClipPlane);
cam.projectionMatrix = genProjection;
}
}
My error lies in projectionM = PerspectiveOffCenter(left, right, bottom, top, near, far);
The debugger states:
Expression denotes a `type', where a 'variable', 'value' or 'method
group' was expected.
Thus, I changed the line to read: projectionM = new PerspectiveOffCenter(left, right, bottom, top, near, far);
But then the error is changed to:
The type 'PerspectiveOffCenter' does not contain a constructor that
takes '6' arguments.
For reasons that are obvious.
So, finally, I changed the line to read: projectionM = new GeneralizedPerspectiveProjection(left, right, bottom, top, near, far);
And the error I get is:
is a 'method' but a 'type' was expected.
With this last error, I'm not sure what it is I should do / missing. Can anyone see what it is that I'm missing to fix this error?
