private static void UpdateProjViewMatrix(Size clientSize)
{
var verticalFov = (float)Math.PI / 4;
var aspect = clientSize.Width / (float)clientSize.Height;
var proj = MatrixCM.PerspectiveFovRH(verticalFov, aspect, 1.0f, 5000.0f);
projView = proj * view;
if (zfirst)
{
zfirst = false;
var lookat = new Vector3(0, 0.5f, 0);
//var pos = new Vector4(lookat + 0.1f * (cameraEye - lookat), 1);//new Vector4(1, 2, 3, 1);
var pos = new Vector4(0.5f, 1.0f, 0.5f, 1);
var projViewRm = projView;
projViewRm.Transpose();
var homogeneous = Vector4.Transform(pos, projViewRm);
Console.WriteLine("pos: " + pos);
Console.WriteLine("posh: " + homogeneous);
homogeneous /= homogeneous.W;
Console.WriteLine("poshn: " + homogeneous);
var projViewRmInv = projViewRm;
projViewRmInv.Invert();
Console.WriteLine();
Console.WriteLine(projViewRmInv * projViewRm);
Console.WriteLine();
Console.WriteLine(projViewRm * projViewRmInv);
Console.WriteLine();
var x = Vector4.Transform(homogeneous, projViewRmInv);
Console.WriteLine(x);
x /= x.W;
Console.WriteLine(x);
}
}
public void AddSpotlight(Vector3 position, Vector3 lookat, Vector3 up, float theta, Color color, float near, float far, float daRatioConstant, float daRatioLinear, float daRatioQuadratic, float edgeSpotlightAttenuationPercent = 1.0f / 256.0f)
{
var projCm = MatrixCM.PerspectiveFovRH(theta, 1.0f, near, far);
var viewCm = MatrixCM.ViewLookAtRH(position, lookat, up);
// solve distance attenuation constants: 1/256 = atten = 1 / (x * darc + far * x * darl + far * far * x * darq)
// 256 = x * darc + far * x * darl + far * far * x * darq
// 256 = x * (darc + far * darl + far * far * darq)
var x = 256 / (daRatioConstant + far * daRatioLinear + far * far * daRatioQuadratic);
//Console.WriteLine(x + " " + daRatioConstant + " " + daRatioLinear + " " + daRatioQuadratic);
var direction = lookat - position;
direction.Normalize();
//Console.WriteLine("@8: " + (daRatioConstant * x + daRatioLinear * x * 8 + daRatioQuadratic * x * 8 * 8));
//Console.WriteLine("@far: " + (daRatioConstant * x + daRatioLinear * x * far + daRatioQuadratic * x * far * far));
// solve spotlight attenuation constant.
// edge% = atten_spotlight = dot(spotlightDirectionUnit, objectDirectionUnit) ^ power
// edge% = cos(theta) ^ power
// Math.Log(edge%, cos(theta)) = power
var power = Math.Log(edgeSpotlightAttenuationPercent, Math.Cos(theta));
//Console.WriteLine("Power: " + power);
//Console.WriteLine("@far: " + Math.Pow(Math.Cos(theta), power));
var projViewCm = projCm * viewCm;
AddSpotlight(new SpotlightInfo {
Origin = position,
Direction = direction,
Color = color,
DistanceAttenuationConstant = x * daRatioConstant,
DistanceAttenuationLinear = x * daRatioLinear,
DistanceAttenuationQuadratic = x * daRatioQuadratic,
SpotlightAttenuationPower = (float)power,
ProjViewCM = projViewCm,
});
}
