I got some success, but still it's not what I wanted.
Essentially, I am doing a "pretrace", store the light/shadow values in a variable and then re-trace again, but that time the DE function applies some noise based on the distort value obtained earlier.
It looks nice, however, the problem is that it does not give me a real 3d - it's only working more less as a map, thus the pixels change color, but are not shifted in fact. That causes problems with obscurance and depth.
Below is my color function.
[quote]SColor color(SRay Ray) {
float glow = 0.5;
vec3 hitNormal = vec3(0.0);
vec3 col = vec3(0.0);
vec3 col0 = vec3(0.0);
vec3 RWeight = vec3(1.);
SColor Color;
// Reflections loop
for(int i=0; i<= ReflectionsNumber; i++){
if (i>0) isPrimaryPass = false;
vec3 prevPos = SRCurrentPt(Ray);
// ----> TRACE <------
SRay RayOriginal = Ray;
Color = trace(Ray, hitNormal, glow);
vec3 curPos = SRCurrentPt(Ray);
// Re-trace for distortion
displacement.xyz = hitNormal;
displacement.w = (1-totalShadow) * totalLight;
hitNormal = vec3(0.);
Ray = RayOriginal;
// ----> TRACE Again <------
SColor Color2 = trace(Ray, hitNormal, glow);
Color.RGB = Color2.RGB; // mix(Color.RGB, Color2.RGB, totalShadow);
col0 = Color.RGB;
...
and in DE
float DE(vec3 z){
// some sin noise
float de_n = sin(z.x*DE_NoiseFreq.x)*DE_NoiseAmp.x + sin(z.y*DE_NoiseFreq.y)*DE_NoiseAmp.y + sin(z.z*DE_NoiseFreq.z)*DE_NoiseAmp.z;
float de_obj = Objects(z);
float de_hm = z.z;
// displace only on the second pass
if (tracecount==1){
de_hm += de_n * displacement.w * ShadowDisplacement; // * gizmo;
}
float de_fin = smin(de_hm, de_obj, DE_HeightMapSmooth.y);
return de_fin;
}
Not sure if this approach will give me any good results.
March 15, 2007, 09:43:43 AM
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