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@@ -167,7 +167,50 @@ class Polygon extends Primitive {
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}
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public function addTangents() {
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- throw "Not implemented for this polygon";
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+ if( normals == null )
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+ addNormals();
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+ if( uvs == null )
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+ addUVs();
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+ tangents = [];
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+ for( i in 0...points.length )
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+ tangents[i] = new Point();
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+ var pos = 0;
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+ for( i in 0...triCount() ) {
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+ var i0, i1, i2;
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+ if( idx == null ) {
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+ i0 = pos++;
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+ i1 = pos++;
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+ i2 = pos++;
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+ } else {
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+ i0 = idx[pos++];
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+ i1 = idx[pos++];
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+ i2 = idx[pos++];
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+ }
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+ var p0 = points[i0];
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+ var p1 = points[i1];
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+ var p2 = points[i2];
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+ var uv0 = uvs[i0];
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+ var uv1 = uvs[i1];
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+ var uv2 = uvs[i2];
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+ var n = normals[i0];
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+
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+ var k0 = p1.sub(p0);
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+ var k1 = p2.sub(p0);
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+ k0.scale(uv2.v - uv0.v);
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+ k1.scale(uv1.v - uv0.v);
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+ var t = k0.sub(k1);
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+ var b = n.cross(t);
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+ b.normalize();
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+ t = b.cross(n);
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+ t.normalize();
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+
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+ // add it to each point
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+ tangents[i0].x += t.x; tangents[i0].y += t.y; tangents[i0].z += t.z;
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+ tangents[i1].x += t.x; tangents[i1].y += t.y; tangents[i1].z += t.z;
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+ tangents[i2].x += t.x; tangents[i2].y += t.y; tangents[i2].z += t.z;
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+ }
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+ for( t in tangents )
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+ t.normalize();
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}
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public function addUVs() {
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ncannasse