three.js - Normal map in *.obj file -

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in blender create normal map, export blender obj (wawefront) , there stored in *.mtl file "map_bump".

map_bump have same bumpsacale. parramter in mtl file defines bumpscale in three.js?

my mtl file:

newmtl ship_white ns 0.000000 ka 0.000000 0.000000 0.000000 kd 0.656604 0.656604 0.656604 ks 0.433962 0.433962 0.433962 ni 1.000000 d 1.000000 illum 2 map_kd 2t3l.png map_bump 2t3l_normal.jpg

currently not supported. can remove bump map file , map manually in three.js.

loading texture.

var bmap = three.imageutils.loadtexture('bumpmap.jpg');

you need traverse model , find it's material. e.g.

    object.traverse( function( node ) {         if ( node instanceof three.mesh ) {             // smoothing             node.geometry.computevertexnormals();             console.log(node);         }         if (node instanceof three.mesh && node.material instanceof three.meshphongmaterial ) {             // console.log(node);             geometry = node.geometry;             material = node.material;         }     });

then either assign directly on material need. or create new 3 js mesh , assign there. warned though if obj contains multiple meshes need find 'right' one. 

mesh = new three.mesh( geometry, material); material.bumpmap = bmap; material.bumpscale = 1;

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