public override V3 GetNormal(V3 intersection = null)
{
V3 normal = Normal;
if (!HasBump())
{
normal.Normalize();
return(normal);
}
V3 AB = PointB - PointA;
V3 AC = PointC - PointA;
V3 AI = intersection - PointA;
float u = ((AC ^ Normal) * AI) / (AB ^ AC).Norm();
float v = ((Normal ^ AB) * AI) / (AC ^ AB).Norm();
BumpTexture.Bump(u, v, out float dhdu, out float dhdv);
V3 T2 = AB ^ (dhdv * normal);
V3 T3 = (dhdu * normal) ^ AC;
V3 normalBump = normal + (BumpIntensity * (T2 + T3));
normalBump.Normalize();
return(normalBump);
}
/// <summary>
/// Calcul la normale a partir d une intersection
/// A partir de cette intersection on va calculer u et v
/// </summary>
/// <param name="intersection">L intersection</param>
/// <returns>La normal par rapport a l intersection</returns>
public override V3 GetNormal(V3 intersection = null)
{
Tools.InvertCoordSpherique(FindSpherePoint(intersection), Radius, out float u, out float v);
V3 normal = GetNormal(u, v);
if (!HasBump())
{
normal.Normalize();
return(normal);
}
float uTexture = u / Tools.TAU;
float vTexture = -(v + Tools.PI2) / (Tools.PI2 + Tools.PI2);
BumpTexture.Bump(uTexture, vTexture, out float dhdu, out float dhdv);
V3 T2 = FindPointDerU(u, v) ^ (dhdv * normal);
V3 T3 = (dhdu * normal) ^ FindPointDerV(u, v);
V3 normalBump = normal + (BumpIntensity * (T2 + T3));
normalBump.Normalize();
return(normalBump);
}
public bool Use()
{
var prg = GetShaderProgram();
if (lastUserProgram == null)
{
lastUserProgram = ShaderProgram.Current;
}
ShaderProgram.SwitchResult res = prg.Use();
//prg.SetUniform("MaterialIndex", BufferOffset);
prg.SetUniform("IsTessellatedTerrain", Type == MaterialType.TessellatedTerrain);
prg.SetUniform("TessellationMultiplier", TessellationMultiplier);
prg.SetUniform("InvertUVy", InvertUVy);
prg.SetUniform("IsBillboard", IsBillboard);
prg.SetUniform("SpecularColor", SpecularColor);
prg.SetUniform("DiffuseColor", DiffuseColor);
prg.SetUniform("ParallaxHeightMultiplier", ParallaxHeightMultiplier);
prg.SetUniform("Roughness", Roughness);
prg.SetUniform("Alpha", Alpha);
prg.SetUniform("NormalTexEnabled", NormalsTexture != null);
prg.SetUniform("BumpTexEnabled", BumpTexture != null);
prg.SetUniform("AlphaTexEnabled", AlphaTexture != null);
prg.SetUniform("RoughnessTexEnabled", RoughnessTexture != null);
prg.SetUniform("DiffuseTexEnabled", DiffuseTexture != null);
prg.SetUniform("SpecularTexEnabled", SpecularTexture != null);
if (NormalsTexture != null)
{
NormalsTexture.Use(prg.getConstInt("normalsTexBind"));
}
if (BumpTexture != null)
{
BumpTexture.Use(prg.getConstInt("bumpTexBind"));
}
if (AlphaTexture != null)
{
AlphaTexture.Use(prg.getConstInt("alphaTexBind"));
}
if (RoughnessTexture != null)
{
RoughnessTexture.Use(prg.getConstInt("roughnessTexBind"));
}
if (DiffuseTexture != null)
{
DiffuseTexture.Use(prg.getConstInt("diffuseTexBind"));
}
if (SpecularTexture != null)
{
SpecularTexture.Use(prg.getConstInt("specularTexBind"));
}
return(true);
}
