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- Fresnel V4.0

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Based on feedback (thnx phase!) I found a big disadvantage of the 'real'
fresnel formula. It doesnt degrade to 0.0, causing 2-3 times too many
rays being fired compared to the previous one. So; a lot slower.

Now committed is a hybrid which allows (close to) real, and nice artistic
freedom, *and* it really goes to 0.0 and 1.0, assisting nicely in optimal
render times.
A real doc how it works (with pics) will be made before real release.

- Fixed bug in raytrace: the first renderpass didn't use fresnel for mirror.
- Fixed bug in previewrender, now it closer matches how fresnel renders
This commit is contained in:
Ton Roosendaal
2003-12-23 22:31:48 +00:00
parent 4d8fce8568
commit 8fbff1a3b7
8 changed files with 69 additions and 52 deletions
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24
source/blender/src/previewrender.c
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@@ -783,7 +783,13 @@ static void shade_preview_pixel(ShadeInput *shi, float *vec, int x, int y,char *
}
}
/* set it here, because ray_mirror will affect it */
alpha= mat->alpha;
if(mat->mode & (MA_ZTRA|MA_RAYTRANSP))
if(mat->fresnel_tra!=0.0)
alpha*= fresnel_fac(view, shi->vn, mat->fresnel_tra_i, mat->fresnel_tra);
if(mat->mode & MA_SHLESS) {
temp= 255.0*(mat->r);
if(temp>255) rect[0]= 255; else if(temp<0) rect[0]= 0; else rect[0]= temp;
@@ -860,8 +866,14 @@ static void shade_preview_pixel(ShadeInput *shi, float *vec, int x, int y,char *
/* scale */
div= (0.85*shi->ref[1]);
shi->refcol[0]= mat->ray_mirror*fresnel_fac(view, shi->vn, mat->ang, mat->fresnel_mir);
shi->refcol[0]= mat->ray_mirror*fresnel_fac(view, shi->vn, mat->fresnel_mir_i, mat->fresnel_mir);
/* not real 'alpha', but mirror overriding transparency */
if(mat->mode & MA_RAYTRANSP) {
float fac= sqrt(shi->refcol[0]);
alpha= alpha*(1.0-fac) + fac;
}
else alpha= alpha*(1.0-shi->refcol[0]) + shi->refcol[0];
if(div<0.0) {
/* minus 0.5 prevents too many small tiles in distance */
fac= (int)(shi->ref[0]/(div-0.1) ) + (int)(shi->ref[2]/(div-0.1) );
@@ -903,12 +915,6 @@ static void shade_preview_pixel(ShadeInput *shi, float *vec, int x, int y,char *
}
}
alpha= mat->alpha;
if(mat->mode & (MA_ZTRA|MA_RAYTRANSP))
if(mat->fresnel_tra!=0.0)
alpha*= fresnel_fac(view, shi->vn, mat->ang, mat->fresnel_tra);
/* ztra shade */
if(mat->spectra!=0.0) {
inp = MAX3(isr, isg, isb);
@@ -916,7 +922,7 @@ static void shade_preview_pixel(ShadeInput *shi, float *vec, int x, int y,char *
if(inp>1.0) inp= 1.0;
alpha= (1.0-inp)*alpha+inp;
}
if(alpha!=1.0) {
if(mat->mode & MA_RAYTRANSP) {
refraction_prv(&x, &y, shi->vn, mat->ang);