public void VisualHullTest()
{
var view = Trafo3d.ViewTrafoRH(V3d.III, V3d.OOI, V3d.IOO);
var proj = Trafo3d.PerspectiveProjectionOpenGl(-1, 1, -1, 1, 1, 100);
var vpTrafo = view * proj;
var frustumCorners = new Box3d(-V3d.III, V3d.III).ComputeCorners();
//Min, 0 near left bottom
//new V3d(Max.X, Min.Y, Min.Z), 1 near right bottom
//new V3d(Min.X, Max.Y, Min.Z), 2 near left top
//new V3d(Max.X, Max.Y, Min.Z), 3 near right top
//new V3d(Min.X, Min.Y, Max.Z), 4 far left bottom
//new V3d(Max.X, Min.Y, Max.Z), 5 far right bottom
//new V3d(Min.X, Max.Y, Max.Z), 6 far left top
//Max 7 far right top
// use inverse view-projection to get vertices in world space
frustumCorners.Apply(c => vpTrafo.Backward.TransformPosProj(c));
// hull planes should point outside, assume right-handed transformation to build planes
var refHull = new Hull3d(new[]
{
new Plane3d(frustumCorners[0], frustumCorners[2], frustumCorners[4]), // left
new Plane3d(frustumCorners[1], frustumCorners[5], frustumCorners[3]), // right
new Plane3d(frustumCorners[0], frustumCorners[4], frustumCorners[1]), // bottom
new Plane3d(frustumCorners[2], frustumCorners[3], frustumCorners[6]), // top
new Plane3d(frustumCorners[0], frustumCorners[1], frustumCorners[2]), // near
new Plane3d(frustumCorners[4], frustumCorners[6], frustumCorners[5]), // far
});
var newHull = vpTrafo.GetVisualHull();
for (int i = 0; i < 6; i++)
{
Report.Line("OLD: {0} NEW: {1}", newHull.PlaneArray[i], refHull.PlaneArray[i]);
}
// camera position should have height 1.0 from near-plane
var hRef = refHull.PlaneArray[4].Height(view.GetViewPosition());
var hNew = newHull.PlaneArray[4].Height(view.GetViewPosition());
Assert.True(hRef.ApproximateEquals(1.0, 1e-7) && hRef.ApproximateEquals(hNew, 1e-7));
for (int i = 0; i < 6; i++)
{
Assert.True(newHull.PlaneArray[i].Coefficients.ApproxEqual(refHull.PlaneArray[i].Coefficients, 1e-7));
}
}
