void setProjectionMatrix(const Mat4f &projmat)
{
this->projmat = projmat;
Mat4f projmatinv = projmat.inverse();
// Corners of the frustum in world space
corners[0] = projmatinv.transformPoint(Vec3f(-1, 1, -1));
corners[1] = projmatinv.transformPoint(Vec3f(1, 1, -1));
corners[2] = projmatinv.transformPoint(Vec3f(1, -1, -1));
corners[3] = projmatinv.transformPoint(Vec3f(-1, -1, -1));
corners[4] = projmatinv.transformPoint(Vec3f(-1, 1, 1));
corners[5] = projmatinv.transformPoint(Vec3f(1, 1, 1));
corners[6] = projmatinv.transformPoint(Vec3f(1, -1, 1));
corners[7] = projmatinv.transformPoint(Vec3f(-1, -1, 1));
// Near plane
planes[0] = Plane(corners[0], corners[1], corners[2]);
// Left plane
planes[1] = Plane(corners[0], corners[3], corners[4]);
// Top plane
planes[2] = Plane(corners[0], corners[1], corners[4]);
// Right plane
planes[3] = Plane(corners[1], corners[2], corners[5]);
// Bottom plane
planes[4] = Plane(corners[2], corners[3], corners[6]);
// Far plane
planes[5] = Plane(corners[4], corners[5], corners[6]);
// TODO: Fix normal vectors to point inside!
}
