private Color ComputeDiffuse(
Light l, V3 incidentVec, V3 normalVec, Object3D obj, V2 uv
)
{
Color diffuseIllu = new Color(0, 0, 0);
if (incidentVec * normalVec > 0.0f) {
diffuseIllu = obj.TextureColor(uv) * l.Intensity *
obj.Material.KDiffuse * (incidentVec * normalVec);
}
return diffuseIllu;
}
/// Computes the diffuse and specular components of the Phong
/// reflection model.
/// @Note Avoids code duplication in ComputePointLight and
/// ComputeDirectionalLight.
private Color ComputeDiffuseSpecular(
Light l, Object3D obj, V3 p, V2 uv, V3 incidentVec
)
{
V3 normalVec = obj.Normal(p, uv);
V3 reflectedVec = incidentVec.ReflectedVector(normalVec);
reflectedVec.Normalize();
V3 viewingVec = CameraPos - p;
viewingVec.Normalize();
Color diffuseIllu = ComputeDiffuse(
l, incidentVec, normalVec, obj, uv
);
Color specularIllu = ComputeSpecular(
l, reflectedVec, normalVec, obj, uv
);
return diffuseIllu + specularIllu;
}
private Color ComputeSpecular(
Light l, V3 reflectedVec, V3 viewingVec, Object3D obj, V2 uv
)
{
Color specularIllu = new Color(0, 0, 0);
if (reflectedVec * viewingVec > 0.0f) {
specularIllu = l.Intensity * obj.Material.KSpecular *
Mathf.Pow(
reflectedVec * viewingVec,
obj.Material.Shininess
);
}
return specularIllu;
}