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TriVoxel: Burley + (EON, Gotanda, Chan) Diffuse Models

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This commit is contained in:
Onek8
2026-09-08 22:02:48 -07:00
parent d44fd9993a
commit 42fdff4757
12 changed files with 241 additions and 24 deletions
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8
leenkx/Shaders/deferred_light/deferred_light.frag.glsl
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@ -420,7 +420,7 @@ void main() {
#endif
#endif
envl.rgb *= albedo;
envl.rgb *= diffuseIBL(albedo, roughness, f0, dotNV);
#ifdef _Brdf
envl.rgb *= 1.0 - F; //LV: We should take refracted light into account
@ -581,15 +581,15 @@ void main() {
vec3 sdirect;
if (abs(matp0.x) > 0.001 && dot(wTangent, wTangent) > 0.001) {
vec3 sbitangent = normalize(cross(n, wTangent));
sdirect = lambertDiffuseBRDF(albedo, sdotNL) +
sdirect = diffuseBRDF(albedo, roughness, f0, sdotNL, dotNV, sdotVH) +
anisotropicBRDF(f0, roughness, matp0.x, matp0.y,
wTangent, sbitangent, n, sunDir, v, sdotNL, dotNV) * occspec.y;
} else {
sdirect = lambertDiffuseBRDF(albedo, sdotNL) +
sdirect = diffuseBRDF(albedo, roughness, f0, sdotNL, dotNV, sdotVH) +
specularBRDF(f0, roughness, sdotNL, sdotNH, dotNV, sdotVH) * occspec.y;
}
#else
vec3 sdirect = lambertDiffuseBRDF(albedo, sdotNL) +
vec3 sdirect = diffuseBRDF(albedo, roughness, f0, sdotNL, dotNV, sdotVH) +
specularBRDF(f0, roughness, sdotNL, sdotNH, dotNV, sdotVH) * occspec.y;
#endif

8
leenkx/Shaders/deferred_light_mobile/deferred_light.frag.glsl
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@ -227,7 +227,7 @@ void main() {
#endif
#endif
envl.rgb *= albedo;
envl.rgb *= diffuseIBL(albedo, roughness, f0, dotNV);
#ifdef _Rad // Indirect specular
envl.rgb += prefilteredColor * (f0 * envBRDF.x + envBRDF.y) * 1.5 * occspec.y;
@ -342,15 +342,15 @@ void main() {
vec3 sdirect;
if (abs(matp0.x) > 0.001 && dot(wTangent, wTangent) > 0.001) {
vec3 sbitangent = normalize(cross(n, wTangent));
sdirect = lambertDiffuseBRDF(albedo, sdotNL) +
sdirect = diffuseBRDF(albedo, roughness, f0, sdotNL, dotNV, sdotVH) +
anisotropicBRDF(f0, roughness, matp0.x, matp0.y,
wTangent, sbitangent, n, sunDir, v, sdotNL, dotNV) * occspec.y;
} else {
sdirect = lambertDiffuseBRDF(albedo, sdotNL) +
sdirect = diffuseBRDF(albedo, roughness, f0, sdotNL, dotNV, sdotVH) +
specularBRDF(f0, roughness, sdotNL, sdotNH, dotNV, sdotVH) * occspec.y;
}
#else
vec3 sdirect = lambertDiffuseBRDF(albedo, sdotNL) +
vec3 sdirect = diffuseBRDF(albedo, roughness, f0, sdotNL, dotNV, sdotVH) +
specularBRDF(f0, roughness, sdotNL, sdotNH, dotNV, sdotVH) * occspec.y;
#endif

193
leenkx/Shaders/std/brdf.glsl
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@ -88,6 +88,199 @@ vec3 lambertDiffuseBRDF(const vec3 albedo, const float nl) {
return albedo * INV_PI * nl;
}
#ifdef _BurleyDiffuse
vec3 burleyDiffuseBRDF(const vec3 albedo, const float roughness,
const float dotNL, const float dotNV, const float dotVH) {
float nl = clamp(dotNL, 0.0, 1.0);
float nv = clamp(dotNV, 0.0, 1.0);
float energyBias = mix(0.0, 0.5, roughness);
float energyFactor = mix(1.0, 1.0 / 1.51, roughness);
float fd90 = energyBias + 2.0 * roughness * dotVH * dotVH;
float lightScatter = 1.0 + (fd90 - 1.0) * pow(1.0 - nl, 5.0);
float viewScatter = 1.0 + (fd90 - 1.0) * pow(1.0 - nv, 5.0);
return albedo * INV_PI * lightScatter * viewScatter * energyFactor * nl;
}
#endif
#ifdef _EONDiffuse
const float constant1_FON = 0.5 - 2.0 / (3.0 * PI);
const float constant2_FON = 2.0 / 3.0 - 28.0 / (15.0 * PI);
float E_FON_approx(float mu, float r) {
float mucomp = 1.0 - mu;
const float g1 = 0.0571085289;
const float g2 = 0.491881867;
const float g3 = -0.332181442;
const float g4 = 0.0714429953;
float GoverPi = mucomp * (g1 + mucomp * (g2 + mucomp * (g3 + mucomp * g4)));
return (1.0 + r * GoverPi) / (1.0 + constant1_FON * r);
}
vec3 eonDiffuseBRDF(const vec3 albedo, const float roughness,
const float dotNL, const float dotNV, const float dotVH) {
float r = roughness;
float mu_i = clamp(dotNL, 0.0, 1.0);
float mu_o = clamp(dotNV, 0.0, 1.0);
if (mu_i < 1.0e-7 || mu_o < 1.0e-7) return vec3(0.0);
float dotLV = 2.0 * dotVH * dotVH - 1.0;
float s = dotLV - mu_i * mu_o;
float sovertF = s > 0.0 ? s / max(mu_i, mu_o) : s;
float AF = 1.0 / (1.0 + constant1_FON * r);
vec3 f_ss = (albedo * INV_PI) * AF * (1.0 + r * sovertF);
float EFo = E_FON_approx(mu_o, r);
float EFi = E_FON_approx(mu_i, r);
float avgEF = AF * (1.0 + constant2_FON * r);
vec3 rho_ms = (albedo * albedo) * avgEF
/ max(vec3(1.0) - albedo * (1.0 - avgEF), vec3(1.0e-7));
const float eps = 1.0e-7;
vec3 f_ms = (rho_ms * INV_PI)
* max(eps, 1.0 - EFo)
* max(eps, 1.0 - EFi)
/ max(eps, 1.0 - avgEF);
return (f_ss + f_ms) * mu_i;
}
#endif
#ifdef _GotandaDiffuse
vec3 gotandaDiffuseBRDF(const vec3 albedo, const float roughness, const vec3 f0,
const float dotNL, const float dotNV, const float dotVH) {
float nl = clamp(dotNL, 0.0, 1.0);
float nv = clamp(dotNV, 0.0, 1.0);
float a = roughness * roughness;
float a2 = a * a;
float dotLV = 2.0 * dotVH * dotVH - 1.0;
float Cosri = dotLV - nv * nl;
float a2_13 = a2 + 1.36053;
float Fr = (1.0 - (0.542026 * a2 + 0.303573 * a) / a2_13)
* (1.0 - pow(1.0 - nv, 5.0 - 4.0 * a2) / a2_13)
* ((-0.733996 * a2 * a + 1.50912 * a2 - 1.16402 * a)
* pow(1.0 - nv, 1.0 + 1.0 / (39.0 * a2 * a2 + 1.0)) + 1.0);
float Lm = (max(1.0 - 2.0 * a, 0.0) * (1.0 - pow(1.0 - nl, 5.0))
+ min(2.0 * a, 1.0)) * (1.0 - 0.5 * a * (nl - 1.0)) * nl;
float Vd = (a2 / ((a2 + 0.09) * (1.31072 + 0.995584 * nv)))
* (1.0 - pow(1.0 - nl,
(1.0 - 0.3726732 * nv * nv)
/ (0.188566 + 0.38841 * nv)));
float Bp = Cosri < 0.0 ? 1.4 * nv * nl * Cosri : Cosri;
vec3 Lr = (21.0 / 20.0) * (1.0 - f0) * (Fr * Lm + Vd + Bp);
return max(albedo * INV_PI * Lr, vec3(0.0));
}
#endif
#ifdef _ChanDiffuse
vec3 chanDiffuseBRDF(const vec3 albedo, const float roughness,
const float dotNL, const float dotNV, const float dotVH) {
float nl = clamp(dotNL, 0.0, 1.0);
float nv = clamp(dotNV, 0.0, 1.0);
float vh = clamp(dotVH, 0.0, 1.0);
float a = roughness * roughness;
float a2 = a * a;
float g = clamp((1.0 / 18.0) * log2(2.0 / max(a2, 1e-7) - 1.0), 0.0, 1.0);
float dotNH = clamp((nl + nv) / max(2.0 * vh, 1e-5), 0.0, 1.0);
float F0 = vh + pow(1.0 - vh, 5.0);
float FdV = 1.0 - 0.75 * pow(1.0 - nv, 5.0);
float FdL = 1.0 - 0.75 * pow(1.0 - nl, 5.0);
float Fd = mix(F0, FdV * FdL, clamp(2.2 * g - 0.5, 0.0, 1.0));
float Fb = ((34.5 * g - 59.0) * g + 24.5) * vh
* exp2(-max(73.2 * g - 21.2, 8.9) * sqrt(dotNH));
float Lobe = clamp(Fd + Fb, 0.0, 1.0);
return albedo * INV_PI * Lobe * nl;
}
#endif
vec3 diffuseBRDF(const vec3 albedo, const float roughness, const vec3 f0,
const float dotNL, const float dotNV, const float dotVH) {
#ifdef _BurleyDiffuse
return burleyDiffuseBRDF(albedo, roughness, dotNL, dotNV, dotVH);
#elif defined(_EONDiffuse)
return eonDiffuseBRDF(albedo, roughness, dotNL, dotNV, dotVH);
#elif defined(_GotandaDiffuse)
return gotandaDiffuseBRDF(albedo, roughness, f0, dotNL, dotNV, dotVH);
#elif defined(_ChanDiffuse)
return chanDiffuseBRDF(albedo, roughness, dotNL, dotNV, dotVH);
#else
return lambertDiffuseBRDF(albedo, dotNL);
#endif
}
vec3 lambertDiffuseIBL(const vec3 albedo) {
return albedo;
}
#ifdef _BurleyDiffuse
vec3 burleyDiffuseIBL(const vec3 albedo, const float roughness, const float dotNV) {
float nv = clamp(dotNV, 0.0, 1.0);
float energyBias = mix(0.0, 0.5, roughness);
float energyFactor = mix(1.0, 1.0 / 1.51, roughness);
float fd90 = energyBias + 2.0 * roughness * nv * nv;
float viewScatter = 1.0 + (fd90 - 1.0) * pow(1.0 - nv, 5.0);
return albedo * viewScatter * energyFactor;
}
#endif
#ifdef _EONDiffuse
vec3 eonDiffuseIBL(const vec3 albedo, const float roughness, const float dotNV) {
float r = roughness;
float AF = 1.0 / (1.0 + constant1_FON * r);
float EF = E_FON_approx(clamp(dotNV, 0.0, 1.0), r);
float avgEF = AF * (1.0 + constant2_FON * r);
vec3 rho_ms = (albedo * albedo) * avgEF
/ max(vec3(1.0) - albedo * (1.0 - avgEF), vec3(1.0e-7));
return max(albedo * EF + rho_ms * (1.0 - EF), vec3(0.0));
}
#endif
#ifdef _GotandaDiffuse
vec3 gotandaDiffuseIBL(const vec3 albedo, const float roughness, const vec3 f0, const float dotNV) {
float nv = clamp(dotNV, 0.0, 1.0);
float a = roughness * roughness;
float a2 = a * a;
float a2_13 = a2 + 1.36053;
float Fr = (1.0 - (0.542026 * a2 + 0.303573 * a) / a2_13)
* (1.0 - pow(1.0 - nv, 5.0 - 4.0 * a2) / a2_13)
* ((-0.733996 * a2 * a + 1.50912 * a2 - 1.16402 * a)
* pow(1.0 - nv, 1.0 + 1.0 / (39.0 * a2 * a2 + 1.0)) + 1.0);
float Lm = (max(1.0 - 2.0 * a, 0.0) * (1.0 - pow(1.0 - nv, 5.0))
+ min(2.0 * a, 1.0)) * (1.0 - 0.5 * a * (nv - 1.0)) * nv;
float Vd = (a2 / ((a2 + 0.09) * (1.31072 + 0.995584 * nv)))
* (1.0 - pow(1.0 - nv,
(1.0 - 0.3726732 * nv * nv)
/ (0.188566 + 0.38841 * nv)));
float Cosri = 1.0 - nv * nv;
float Bp = Cosri;
vec3 Lr = (21.0 / 20.0) * (1.0 - f0) * (Fr * Lm + Vd + Bp);
return max(albedo * Lr, vec3(0.0));
}
#endif
#ifdef _ChanDiffuse
vec3 chanDiffuseIBL(const vec3 albedo, const float roughness, const float dotNV) {
float nv = clamp(dotNV, 0.0, 1.0);
float a = roughness * roughness;
float a2 = a * a;
float g = clamp((1.0 / 18.0) * log2(2.0 / max(a2, 1e-7) - 1.0), 0.0, 1.0);
float FdV = 1.0 - 0.75 * pow(1.0 - nv, 5.0);
float Fd = mix(1.0, FdV * FdV, clamp(2.2 * g - 0.5, 0.0, 1.0));
float Fb = ((34.5 * g - 59.0) * g + 24.5)
* exp2(-max(73.2 * g - 21.2, 8.9) * sqrt(nv));
return albedo * clamp(Fd + Fb, 0.0, 1.0);
}
#endif
vec3 diffuseIBL(const vec3 albedo, const float roughness, const vec3 f0, const float dotNV) {
#ifdef _BurleyDiffuse
return burleyDiffuseIBL(albedo, roughness, dotNV);
#elif defined(_EONDiffuse)
return eonDiffuseIBL(albedo, roughness, dotNV);
#elif defined(_GotandaDiffuse)
return gotandaDiffuseIBL(albedo, roughness, f0, dotNV);
#elif defined(_ChanDiffuse)
return chanDiffuseIBL(albedo, roughness, dotNV);
#else
return lambertDiffuseIBL(albedo);
#endif
}
vec3 surfaceAlbedo(const vec3 baseColor, const float metalness) {
return mix(baseColor, vec3(0.0), metalness);
}

6
leenkx/Shaders/std/light.glsl
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@ -131,15 +131,15 @@ vec3 sampleLightCore(const vec3 p, const vec3 n, const vec3 v, const float dotNV
#ifdef _Anisotropy
if (abs(anisotropy) > 0.001 && dot(tangent, tangent) > 0.001) {
vec3 bitangent = normalize(cross(n, tangent));
standard = lambertDiffuseBRDF(albedo, dotNL) +
standard = diffuseBRDF(albedo, rough, f0, dotNL, dotNV, dotVH) +
anisotropicBRDF(f0, rough, anisotropy, anisoRot,
tangent, bitangent, n, l, v, dotNL, dotNV) * spec;
} else {
standard = lambertDiffuseBRDF(albedo, dotNL) +
standard = diffuseBRDF(albedo, rough, f0, dotNL, dotNV, dotVH) +
specularBRDF(f0, rough, dotNL, dotNH, dotNV, dotVH) * spec;
}
#else
standard = lambertDiffuseBRDF(albedo, dotNL) +
standard = diffuseBRDF(albedo, rough, f0, dotNL, dotNV, dotVH) +
specularBRDF(f0, rough, dotNL, dotNH, dotNV, dotVH) * spec;
#endif

8
leenkx/Shaders/std/light_mobile.glsl
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@ -83,16 +83,16 @@ vec3 sampleLight(const vec3 p, const vec3 n, const vec3 v, const float dotNV, co
vec3 direct;
if (abs(anisotropy) > 0.001 && dot(tangent, tangent) > 0.001) {
vec3 bitangent = normalize(cross(n, tangent));
direct = lambertDiffuseBRDF(albedo, dotNL) +
direct = diffuseBRDF(albedo, rough, f0, dotNL, dotNV, dotVH) +
anisotropicBRDF(f0, rough, anisotropy, anisoRot,
tangent, bitangent, n, l, v, dotNL, dotNV) * spec;
} else {
direct = lambertDiffuseBRDF(albedo, dotNL) +
direct = diffuseBRDF(albedo, rough, f0, dotNL, dotNV, dotVH) +
specularBRDF(f0, rough, dotNL, dotNH, dotNV, dotVH) * spec;
}
#else
vec3 direct = lambertDiffuseBRDF(albedo, dotNL) +
specularBRDF(f0, rough, dotNL, dotNH, dotNV, dotVH) * spec;
vec3 direct = diffuseBRDF(albedo, rough, f0, dotNL, dotNV, dotVH) +
specularBRDF(f0, rough, dotNL, dotNH, dotNV, dotVH) * spec;
#endif
#ifdef _ExtBRDF

2
leenkx/Shaders/voxel_resolve_ao/voxel_resolve_ao.comp.glsl
View File

@ -151,7 +151,7 @@ void main() {
#endif
#endif
envl.rgb *= albedo;
envl.rgb *= diffuseIBL(albedo, roughness, f0, dotNV);
#ifdef _Brdf
envl.rgb *= 1.0 - F; //LV: We should take refracted light into account

4
leenkx/Shaders/voxel_resolve_diffuse/voxel_resolve_diffuse.comp.glsl
View File

@ -137,7 +137,7 @@ void main() {
envl.rgb = pow(envl.rgb, vec3(2.2));
#endif
envl.rgb *= albedo;
envl.rgb *= diffuseIBL(albedo, roughness, f0, dotNV);
#ifdef _Brdf
envl.rgb *= 1.0 - F; //LV: We should take refracted light into account
@ -146,7 +146,7 @@ void main() {
envl.rgb *= envmapStrength * voxelgiEnv * occspec.x;
vec4 trace = traceDiffuse(P, n, voxels, clipmaps);
vec3 color = trace.rgb * albedo * (1.0 - F);
vec3 color = trace.rgb * diffuseIBL(albedo, roughness, f0, dotNV) * (1.0 - F);
color += envl * (1.0 - trace.a);
imageStore(voxels_diffuse, ivec2(pixel), vec4(color, 1.0));

13
leenkx/blender/lnx/make_renderpath.py
View File

@ -173,6 +173,19 @@ def add_world_defs():
wrd.world_defs += '_Brdf'
assets.add_khafile_def("lnx_brdf")
if rpdat.lnx_diffuse_model == 'Burley':
wrd.world_defs += '_BurleyDiffuse'
assets.add_khafile_def('lnx_burley_diffuse')
elif rpdat.lnx_diffuse_model == 'EON':
wrd.world_defs += '_EONDiffuse'
assets.add_khafile_def('lnx_eon_diffuse')
elif rpdat.lnx_diffuse_model == 'Gotanda':
wrd.world_defs += '_GotandaDiffuse'
assets.add_khafile_def('lnx_gotanda_diffuse')
elif rpdat.lnx_diffuse_model == 'Chan':
wrd.world_defs += '_ChanDiffuse'
assets.add_khafile_def('lnx_chan_diffuse')
def build():
rpdat = lnx.utils.get_rp()
project_path = lnx.utils.get_fp()

11
leenkx/blender/lnx/material/make_mesh.py
View File

@ -737,7 +737,7 @@ def make_forward_base(con_mesh, parse_opacity=False, transluc_pass=False):
if '_Rad' in wrd.world_defs:
frag.write('prefilteredColor = pow(prefilteredColor, vec3(2.2));')
frag.write('envl *= albedo;')
frag.write('envl *= diffuseIBL(albedo, roughness, f0, dotNV);')
if '_Brdf' in wrd.world_defs:
frag.write('envl.rgb *= 1.0 - F;')
@ -771,7 +771,7 @@ def make_forward_base(con_mesh, parse_opacity=False, transluc_pass=False):
if '_VoxelGI' in wrd.world_defs:
frag.write('vec4 diffuse_indirect = traceDiffuse(wposition, n, voxels, clipmaps);')
frag.write('indirect = (diffuse_indirect.rgb * albedo * (1.0 - F) + envl * (1.0 - diffuse_indirect.a)) * voxelgiDiff;')
frag.write('indirect = (diffuse_indirect.rgb * diffuseIBL(albedo, roughness, f0, dotNV) * (1.0 - F) + envl * (1.0 - diffuse_indirect.a)) * voxelgiDiff;')
frag.write('if (roughness < 1.0 && specular > 0.0) {')
frag.write(' indirect += traceSpecular(wposition, n, voxels, voxelsSDF, vVec, roughness * roughness, clipmaps, gl_FragCoord.xy, velocity).rgb * F * voxelgiRefl;')
frag.write('}')
@ -847,7 +847,7 @@ def make_forward_base(con_mesh, parse_opacity=False, transluc_pass=False):
if '_ExtBRDF' in wrd.world_defs:
frag.write('float sunLayerWeight;')
frag.write('vec3 sdirect = applyExtBRDFLayers(')
frag.write(' lambertDiffuseBRDF(albedo, sdotNL) + specularBRDF(f0, roughness, sdotNL, sdotNH, dotNV, sdotVH) * specular,')
frag.write(' diffuseBRDF(albedo, roughness, f0, sdotNL, dotNV, sdotVH) + specularBRDF(f0, roughness, sdotNL, sdotNH, dotNV, sdotVH) * specular,')
frag.write(' albedo, f0, roughness, sdotNL, dotNV, sdotNH, sdotVH, n, sunDir, vVec, sh')
if '_ClearCoat' in wrd.world_defs:
frag.write(', clearcoat, clearcoatRough, coatIOR, coatTint, nCoat')
@ -858,7 +858,7 @@ def make_forward_base(con_mesh, parse_opacity=False, transluc_pass=False):
frag.write(', sunLayerWeight);')
frag.write('direct += sdirect * sunCol * svisibility;')
else:
frag.write('direct += (lambertDiffuseBRDF(albedo, sdotNL) + specularBRDF(f0, roughness, sdotNL, sdotNH, dotNV, sdotVH) * specular) * sunCol * svisibility;')
frag.write('direct += (diffuseBRDF(albedo, roughness, f0, sdotNL, dotNV, sdotVH) + specularBRDF(f0, roughness, sdotNL, sdotNH, dotNV, sdotVH) * specular) * sunCol * svisibility;')
# sun
if '_SinglePoint' in wrd.world_defs:
@ -880,7 +880,8 @@ def make_forward_base(con_mesh, parse_opacity=False, transluc_pass=False):
else:
frag.add_uniform('vec2 lightProj', link='_lightPlaneProj', included=True)
frag.add_uniform('samplerCubeShadow shadowMapPoint[1]', included=True)
frag.add_uniform('samplerCube shadowMapPointTransparent[1]', included=True)
if is_transparent_shadows:
frag.add_uniform('samplerCube shadowMapPointTransparent[1]', included=True)
frag.write('direct += sampleLight(')
frag.write(' wposition, n, vVec, dotNV, pointPos, pointCol, albedo, roughness, specular, f0')
if is_shadows:

3
leenkx/blender/lnx/material/make_voxel.py
View File

@ -411,7 +411,8 @@ def make_gi(context_id):
frag.add_uniform('vec4 pointLightDataArray[maxLightsCluster]', link='_pointLightsAtlasArray', included=True)
else:
frag.add_uniform('samplerCubeShadow shadowMapPoint[4]', included=True)
frag.add_uniform('samplerCube shadowMapPointTransparent[4]', included=True)
if is_transparent_shadows:
frag.add_uniform('samplerCube shadowMapPointTransparent[4]', included=True)
vert.add_out('vec4 wvppositionGeom')
vert.add_uniform('mat4 VP', '_viewProjectionMatrix')

8
leenkx/blender/lnx/props_renderpath.py
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@ -486,6 +486,14 @@ class LnxRPListItem(bpy.types.PropertyGroup):
('Solid', 'Solid', 'Solid'),
],
name="Materials", description="Material builder", default='Full', update=update_material_model)
lnx_diffuse_model: EnumProperty(
items=[('Lambert', 'Lambert', 'Lambert'),
('Burley', 'Burley', 'Burley with Frostbite energy renormalization'),
('EON', 'Oren-Nayar', 'Energy preserving Oren Nayar with multi scatter compensation'),
('Gotanda', 'Gotanda GGX Diffuse', 'Microfacet GGX diffuse with Fresnel and visibility'),
('Chan', 'Chan Retroreflective', 'GGX microfacet diffuse with retroreflective lobe'),
],
name="Diffuse BRDF", description="Diffuse BRDF model", default='Burley', update=update_material_model)
lnx_rp_displacement: EnumProperty(
items=[('Off', 'Off', 'Off'),
('Vertex', 'Vertex', 'Vertex'),

1
leenkx/blender/lnx/props_ui.py
View File

@ -1696,6 +1696,7 @@ class LNX_PT_RenderPathRendererPanel(bpy.types.Panel):
if rpdat.rp_renderer == 'Forward':
layout.prop(rpdat, 'rp_depthprepass')
layout.prop(rpdat, 'lnx_material_model')
layout.prop(rpdat, 'lnx_diffuse_model')
layout.prop(rpdat, 'rp_translucency_state')
layout.prop(rpdat, 'rp_overlays_state')
layout.prop(rpdat, 'rp_decals_state')