public override Color GetColor(Raytracer raytracer, Ray ray, RaycastHit hit, TraceData traceData)
{
Vector2 texCoord;
Vector3 surfaceNormal;
Vector3 tangent, binormal;
bool texCoordAndTangentRequired = NormalMap != null || DiffuseTexture != null || SpecularMap != null || ReflectionMap != null;
texCoordAndTangentRequired = true; // DEBUG
if (texCoordAndTangentRequired)
{
Vector3 localNormal;
Vector3 localTangent;
ColliderUtils.GetTexCoordAndTangent(
hit,
out texCoord, out localNormal, out localTangent
);
tangent = hit.collider.transform.TransformDirection(localTangent);
surfaceNormal = hit.collider.transform.TransformDirection(localNormal);
binormal = Vector3.Cross(tangent, surfaceNormal);
#region Debug Visualisation
#if DEBUG_SHOW_TEX_COORDS
return(new Color(texCoord.x, texCoord.y, 0, 1));
#endif
#if DEBUG_SHOW_BARYCENTRIC_COORDS
Vector3 dbgBc = hit.barycentricCoordinate;
return(new Color(dbgBc.x, dbgBc.y, dbgBc.z, 1));
#endif
#if DEBUG_SHOW_NORMALS
Vector3 dbgLocalNormal = localNormal;
//dbgLocalNormal = new Vector3 (
// Mathf.Abs ( dbgLocalNormal.x ),
// Mathf.Abs ( dbgLocalNormal.y ),
// Mathf.Abs ( dbgLocalNormal.z )
//);
dbgLocalNormal = (dbgLocalNormal + Vector3.one) * 0.5f;
return(new Color(dbgLocalNormal.x, dbgLocalNormal.y, dbgLocalNormal.z, 1));
#endif
#if DEBUG_SHOW_TANGENTS
Vector3 dbgLocalTangent = localTangent;
if (false)
{
dbgLocalTangent = new Vector3(
Mathf.Abs(dbgLocalTangent.x),
Mathf.Abs(dbgLocalTangent.y),
Mathf.Abs(dbgLocalTangent.z)
);
}
else if (false)
{
dbgLocalTangent = new Vector3(
Mathf.Abs(dbgLocalTangent.x > 0 ? dbgLocalTangent.x : 0),
Mathf.Abs(dbgLocalTangent.y > 0 ? dbgLocalTangent.y : 0),
Mathf.Abs(dbgLocalTangent.z > 0 ? dbgLocalTangent.z : 0)
);
}
else
{
dbgLocalTangent = (dbgLocalTangent + Vector3.one) * 0.5f;
}
return(new Color(dbgLocalTangent.x, dbgLocalTangent.y, dbgLocalTangent.z, 1));
#endif
#if DEBUG_SHOW_BINORMALS
Vector3 localBinormal = Vector3.Cross(localTangent, localNormal);
Vector3 dbgBinormal = localBinormal;
dbgBinormal = new Vector3(
Mathf.Abs(dbgBinormal.x),
Mathf.Abs(dbgBinormal.y),
Mathf.Abs(dbgBinormal.z)
);
return(new Color(dbgBinormal.x, dbgBinormal.y, dbgBinormal.z, 1));
#endif
#endregion Debug Visualisation
}
else
{
texCoord = Vector2.zero;
surfaceNormal = hit.normal;
tangent = Vector3.zero;
binormal = Vector3.zero;
}
bool entering = Vector3.Dot(hit.normal, ray.direction) <= 0;
surfaceNormal = entering ? surfaceNormal : -surfaceNormal;
/* TODO: revise where "entering" calculated upon hit.normal should be replaced
* with "entering" calculated upon surfaceNormal transformed with TBN. */
if (NormalMap != null && NormalMapInfluence > 0)
{
var normalMapRt = TextureCache.FromUnityTexture(NormalMap);
Color normalMapColor = normalMapRt.GetFilteredPixel(texCoord.x, texCoord.y);
Vector3 texNormal = new Vector3(normalMapColor.r, normalMapColor.g, normalMapColor.b);
texNormal = 2 * texNormal - Vector3.one;
texNormal.Normalize();
Vector3 texNormalWorld = Raytracer.TransformTbn(texNormal, tangent, binormal, surfaceNormal);
float normalMapInfluence = Mathf.Clamp01(NormalMapInfluence);
surfaceNormal = Vector3.Lerp(surfaceNormal, texNormalWorld, normalMapInfluence).normalized;
#if DEBUG_SHOW_SURFACE_NORMALS
Vector3 dbgSurfaceNormal = surfaceNormal;
//dbgSurfaceNormal = new Vector3 (
// Mathf.Abs ( dbgSurfaceNormal.x ),
// Mathf.Abs ( dbgSurfaceNormal.y ),
// Mathf.Abs ( dbgSurfaceNormal.z )
//);
dbgSurfaceNormal = (dbgSurfaceNormal + Vector3.one) * 0.5f;
return(new Color(dbgSurfaceNormal.x, dbgSurfaceNormal.y, dbgSurfaceNormal.z, 1));
#endif
}
float specularIntensity = SpecularComponent;
if (SpecularMap != null && SpecularMapInfluence > 0 && specularIntensity > 0)
{
var specularMapRt = TextureCache.FromUnityTexture(SpecularMap);
Color specularMapColor = specularMapRt.GetFilteredPixel(texCoord.x, texCoord.y);
specularIntensity *= specularMapColor.grayscale * specularMapColor.a;
float specularMapInfluence = Mathf.Clamp01(SpecularMapInfluence);
specularIntensity = Mathf.Lerp(SpecularComponent, specularIntensity, specularMapInfluence);
}
Color totalColor = Color.black;
Color diffuseLightSumColor = raytracer.OverrideAmbientLight ? raytracer.AmbientLight : RenderSettings.ambientLight;
diffuseLightSumColor *= DiffuseComponent;
Color specularLightSumColor = Color.black;
var lights = Light.GetLights(LightType.Point, 0);
foreach (var light in lights)
{
Vector3 vToLight = light.transform.position - hit.point;
float lightVolumeRadius = light.range * 0.00625f; // Empirical coefficient.
float distance = vToLight.magnitude - lightVolumeRadius;
if (distance < 0)
{
distance = 0;
}
else if (distance >= light.range)
{
continue;
}
Vector3 dirToLight = vToLight.normalized;
float attenuation;
attenuation = 1 - distance / light.range;
attenuation = attenuation * attenuation;
float lightIntensity = light.intensity * LightIntensityFactor;
if (DiffuseComponent > 0)
{
float diffuseIntensity = Vector3.Dot(dirToLight, surfaceNormal);
if (diffuseIntensity > 0)
{
diffuseIntensity = Mathf.Pow(diffuseIntensity, DiffuseExponent);
Color diffuseLightColor = light.color * attenuation * diffuseIntensity * lightIntensity;
diffuseLightSumColor += diffuseLightColor;
}
}
if (specularIntensity > 0)
{
Vector3 reflectionDir = Vector3.Reflect(-dirToLight, surfaceNormal);
Vector3 vToView = raytracer.Camera.transform.position - hit.point;
Vector3 dirToView = vToView.normalized;
float specularity = Vector3.Dot(reflectionDir, dirToView);
if (specularity > 0)
{
specularity = Mathf.Pow(specularity, SpecularPower);
Color specularLightColor = light.color * attenuation * specularity * lightIntensity;
specularLightSumColor += specularLightColor;
}
}
}
Color diffuseColor;
if (DiffuseTexture != null)
{
var diffuseTextureRt = TextureCache.FromUnityTexture(DiffuseTexture);
// TODO: calculate miplevel, get the color according to its value.
Color texColor = diffuseTextureRt.GetFilteredPixel(texCoord.x, texCoord.y);
if (texColor.a < 1 && DiffuseColorIsBackground)
{
diffuseColor = Color.Lerp(this.DiffuseColor, texColor, texColor.a);
}
else
{
diffuseColor = Color.Lerp(Color.black, texColor, texColor.a);
}
diffuseColor.a = texColor.a;
}
else
{
diffuseColor = this.DiffuseColor;
}
totalColor = diffuseLightSumColor * diffuseColor * DiffuseComponent + specularLightSumColor * specularIntensity;
if (raytracer.MustInterrupt(totalColor, traceData))
{
return(totalColor);
}
bool willReflect;
float reflectionIntensity;
if (entering)
{
willReflect = ReflectionComponent > 0 && traceData.NumReflections < raytracer.MaxReflections;
reflectionIntensity = ReflectionComponent;
}
else
{
willReflect = InnerReflectionComponent > 0 && traceData.NumInnerReflections < raytracer.MaxInnerReflections;
reflectionIntensity = InnerReflectionComponent;
}
if (willReflect && ReflectionMap != null && ReflectionMapInfluence > 0)
{
var reflectionMapRt = TextureCache.FromUnityTexture(ReflectionMap);
Color reflectionMapColor = reflectionMapRt.GetFilteredPixel(texCoord.x, texCoord.y);
float reflectionMapIntensity = reflectionMapColor.grayscale * reflectionMapColor.a;
float reflectionMapInfluence = Mathf.Clamp01(ReflectionMapInfluence);
reflectionIntensity = Mathf.Lerp(reflectionIntensity, reflectionMapIntensity * reflectionIntensity, reflectionMapInfluence);
willReflect = reflectionIntensity > 0;
}
float refractionIntensity = RefractionComponent;
if (RefractWhereTranslucent)
{
refractionIntensity *= 1 - diffuseColor.a * DiffuseComponent;
}
bool willRefract = refractionIntensity > 0 && traceData.NumRefractions < raytracer.MaxRefractions;
bool forkingRequired = willReflect && willRefract;
TraceData tdForRefraction;
if (forkingRequired)
{
tdForRefraction = traceData.Fork();
}
else
{
tdForRefraction = traceData;
}
if (willReflect)
{
if (entering)
{
traceData.NumReflections++;
traceData.Counters.Reflections++;
}
else
{
traceData.NumInnerReflections++;
traceData.Counters.InnerReflections++;
}
Vector3 reflectionDir = Vector3.Reflect(ray.direction, surfaceNormal);
Vector3 pushedOutPoint = hit.point + reflectionDir * Raytracer.PushOutMagnitude;
Color reflectionColor = raytracer.Trace(new Ray(pushedOutPoint, reflectionDir), traceData);
totalColor += reflectionColor * reflectionIntensity;
if (raytracer.MustInterrupt(totalColor, traceData))
{
return(totalColor);
}
}
if (willRefract)
{
tdForRefraction.NumRefractions++;
tdForRefraction.Counters.Refractions++;
CoefficientOut = RefractionIndex;
CoefficientIn = 1 / RefractionIndex;
if (CoefficientOut > 1)
{
CriticalOutAngleCos = Mathf.Sqrt(1 - CoefficientIn * CoefficientIn);
CriticalInAngleCos = 0;
}
else
{
CriticalOutAngleCos = 0;
CriticalInAngleCos = Mathf.Sqrt(1 - CoefficientOut * CoefficientOut);
}
float criticalAngleCos = entering ? CriticalInAngleCos : CriticalOutAngleCos;
Vector3 refractionDir;
float nDotRay = Vector3.Dot(surfaceNormal, ray.direction);
if (Mathf.Abs(nDotRay) >= criticalAngleCos)
{
if (entering)
{
tdForRefraction.PenetrationStack.Push(hit);
}
else
{
tdForRefraction.PenetrationStack.Pop();
}
float k = entering ? CoefficientIn : CoefficientOut;
refractionDir = Raytracer.Refract(ray.direction, surfaceNormal, nDotRay, k);
refractionDir.Normalize();
}
else // Total internal reflection.
{
refractionDir = Vector3.Reflect(ray.direction, surfaceNormal);
}
Vector3 pushedOutPoint = hit.point + refractionDir * Raytracer.PushOutMagnitude;
Color refractionColor = raytracer.Trace(new Ray(pushedOutPoint, refractionDir), tdForRefraction);
if (ColorAberration != 0 && entering)
{
//float rDotRay = Vector3.Dot ( refractionDir, ray.direction );
refractionColor = HsvColor.ChangeHue(refractionColor, (1 + nDotRay) * ColorAberration);
}
totalColor += refractionColor * refractionIntensity;
if (raytracer.MustInterrupt(totalColor, tdForRefraction))
{
return(totalColor);
}
}
return(totalColor);
}