public static Matrix4x4 GetProjectionMatrix(this Camera camera, float texelOffsetX, float texelOffsetY)
{
if (camera == null)
{
return(Matrix4x4.identity);
}
Vector4 extents = GetProjectionExtents(camera, texelOffsetX, texelOffsetY);
float cf = camera.farClipPlane;
float cn = camera.nearClipPlane;
float xm = extents.z - extents.x;
float xp = extents.z + extents.x;
float ym = extents.w - extents.y;
float yp = extents.w + extents.y;
if (camera.orthographic)
{
return(Matrix4x4Extension.GetOrthographicProjection(xm, xp, ym, yp, cn, cf));
}
else
{
return(Matrix4x4Extension.GetPerspectiveProjection(xm * cn, xp * cn, ym * cn, yp * cn, cn, cf));
}
}
public static Matrix4x4 GetPerspectiveProjection(this Camera camera, float texelOffsetX, float texelOffsetY)
{
if (camera == null)
{
return(Matrix4x4.identity);
}
float oneExtentY = Mathf.Tan(0.5f * Mathf.Deg2Rad * camera.fieldOfView);
float oneExtentX = oneExtentY * camera.aspect;
float texelSizeX = oneExtentX / (0.5f * camera.pixelWidth);
float texelSizeY = oneExtentY / (0.5f * camera.pixelHeight);
float oneJitterX = texelSizeX * texelOffsetX;
float oneJitterY = texelSizeY * texelOffsetY;
float cf = camera.farClipPlane;
float cn = camera.nearClipPlane;
float xm = (oneJitterX - oneExtentX) * cn;
float xp = (oneJitterX + oneExtentX) * cn;
float ym = (oneJitterY - oneExtentY) * cn;
float yp = (oneJitterY + oneExtentY) * cn;
return(Matrix4x4Extension.GetPerspectiveProjection(xm, xp, ym, yp, cn, cf));
}