static float ElementShadow(Vector3 v, float rSquared, Vector3 receiverNormal,
Vector3 emitterNormal, float emitterArea)
{
// we assume that emitterArea has already been divided by PI
return((1.0f - 1.0f / SstlHelper.Sqrt(emitterArea / rSquared + 1.0f)) *
SstlHelper.Clamp(Vector3.Dot(emitterNormal, v), 0f, 1.0f) *
SstlHelper.Clamp(4 * Vector3.Dot(receiverNormal, v), 0f, 1.0f));
}
public void __Render(Matrix4 mvp)
{
if (Verteces.Count == 0)
{
return;
}
Vector3 ambient = new Vector3(0.1f, 0.1f, 0.1f);
Vector3 lightVecNormalized = Vector3.Normalize(new Vector3(0.5f, 0.5f, 2));
Vector3 lightColor = new Vector3(0.7f, 0.7f, 0.7f);
Vector3 lightColorRefl = new Vector3(0.7f, 0.0f, 0.0f);
if (!AoTest)
{
GL.Begin(PrimitiveType.Triangles);
for (int i = 0; i < Indeces.Count; i += 3)
{
VertexPositionNormalTexture v0 = Verteces[(int)Indeces[i]];
var normal = -Vector4.Transform(new Vector4(v0.Normal, 0), mvp).Xyz;
float diffuse = SstlHelper.Clamp(Vector3.Dot(lightVecNormalized, Vector3.Normalize(normal)), 0.0f,
1.0f);
float diffuseRefl = SstlHelper.Clamp(Vector3.Dot(lightVecNormalized, Vector3.Normalize(-normal)),
0.0f, 1.0f);
var outFragColor = new Vector4(ambient + (diffuse * lightColor + diffuseRefl * lightColorRefl) * v0.Ao,
1.0f);
GL.Color4(outFragColor);
GL.Normal3(v0.Normal);
GL.Vertex3(v0.Position);
GL.Vertex3(Verteces[(int)Indeces[i + 1]].Position);
GL.Vertex3(Verteces[(int)Indeces[i + 2]].Position);
}
GL.End();
}
else
{
lightColor = new Vector3(0.0f, 0.0f, 0.0f);
lightColorRefl = new Vector3(1.0f, 0.0f, 0.0f);
GL.Begin(PrimitiveType.Triangles);
for (int i = 0; i < Indeces.Count; i += 3)
{
VertexPositionNormalTexture v0 = Verteces[(int)Indeces[i]];
var outFragColor = new Vector4(Vector3.Lerp(lightColorRefl, lightColor, v0.Ao), 1.0f);
GL.Color4(outFragColor);
GL.Normal3(v0.Normal);
GL.Vertex3(v0.Position);
GL.Vertex3(Verteces[(int)Indeces[i + 1]].Position);
GL.Vertex3(Verteces[(int)Indeces[i + 2]].Position);
}
GL.End();
}
}
