Technique 'ambient' node case added

[poof86]

The ambient node case is missing from technique/shader parsing

[mrdoob]

We don't support ambient in our built-in materials though.

[poof86]

But there is support for ambient occlusion textures. I was trying to pick up ambient and emissive textures in my models and set them to the material.aoMap property.

Btw, I am missing a lightMap feature for the Basic/Constant material. I see it was removed with version r71.
To still get the result I want (a detailed diffuse texture blended with a lightMap) I changed the THREE.ShaderChunk[ 'aomap_fragment’ ] chunk with the following:

#ifdef USE_AOMAP
vec3 ambientOcclusion = texture2D( aoMap, vUv2 ).rgb * aoMapIntensity;
reflectedLight.indirectDiffuse = min( reflectedLight.indirectDiffuse.rgb * 2.0 * ambientOcclusion.rgb, vec3(1.0) );
#if defined( USE_ENVMAP ) && defined( STANDARD )
float dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );
reflectedLight.indirectSpecular *= computeSpecularOcclusion( dotNV, ambientOcclusion, material.specularRoughness );
#endif
#endif

Inspired by WestLangley comment:
#5741 (comment)

Maybe ColladaLoader.js can use the ambient texture for material.aoMap and emissive texture for material.lightMap?
Lightmaps on BasicMaterial would use the following shader chunk:

#ifdef USE_LIGHTMAP
reflectedLight.indirectDiffuse = min( reflectedLight.indirectDiffuse.rgb * 2.0 * texture2D( lightMap, vUv2 ).rgb * lightMapIntensity, vec3(1.0) );
#endif

[WestLangley]

@poof86

Lightmaps in three.js are now treated as a source of indirect (ambient) light, and are purely additive to total indirect light.

Ambient occlusion maps in three.js occlude only indirect (ambient) light.

MeshBasicMaterial does not respond to lights.

three.js materials no longer have an ambient property. The ambient reflectance of the material is assumed to be the same as the diffuse reflectance of the material (a.k.a, the material's color).

[mrdoob]

Do you have any example files that use these maps?

[poof86]

I'll make a quick example just a sec

[poof86]

I understand,

It would be nice if there is an easy way to use the BasicMaterial to blend detailed diffuse textures and prebaked lighting textures. Maybe add a different kind of textureMap property for this technique? The BasicMaterial is ideal for when you want to be as less resource intensive as possible right? So support for this would be great :)

Should I close the pull request?

[WestLangley]

By the way, MeshBasicMaterial does support ambient occlusion maps.

#6588
#6364 (comment)

[mrdoob]

Now that MeshBasicMaterial supports lightMap. Is this PR needed?

[poof86]

The lightmap shader uses a different formula, but I will test to see if it has similar results.
Sorry for not posting an example yet, was quite busy and forgot :/

[Mugen87]

Old ColladaLoader has been removed.