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render3d: a glTF material's factors are drawn - base colour, roughness, metallic and emission

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gltf_factors reads pbrMetallicRoughness.baseColorFactor, metallicFactor, roughnessFactor and the
emissiveFactor into the primitive (pr.fac), and prim_factors hands them to every program that draws its
textures (actors, the scatter's meshes and levels, the impostor bake) as 1 - factor, so a program never
given them - or a material that gives none (pr.fac null) - multiplies by 1 and draws as before. An
untextured material with a colour (or a metal/roughness) samples a pure white for it, so the factor is
exactly what it draws: horse_cornea is its own colour, not the 200 grey every untextured part had.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 18:52:42 +03:00
parent d2e1f804ce
commit f79390838a
27 changed files with 221 additions and 114 deletions
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packages/ludic.render3d/shaders/bake.frag
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@ -6,9 +6,10 @@ in float v_seed;
layout(location = 0) out vec4 o_albedo;
layout(location = 1) out vec4 o_normal;
uniform sampler2D u_diff;
uniform vec4 u_fac_base_inv; // a glTF material's base colour factor, as 1 - factor
uniform sampler2D u_arm;
void main() {
vec4 d = texture(u_diff, v_uv);
vec4 d = texture(u_diff, v_uv) * (vec4(1.0) - u_fac_base_inv);
if (d.a < 0.5) discard; // cut-out cards (needles, blades, leaves) bake with their shape
vec3 N = normalize(v_nrm);
if (!gl_FrontFacing) N = -N;