Fixed RectAreaLight.

src/renderers/WebGLRenderer.js

@@ -1923,6 +1923,12 @@ function WebGLRenderer( parameters ) {
 
 			}
 
+			// RectAreaLight Texture
+			// TODO (mrdoob): Find a nicer implementation
+
+			if ( m_uniforms.ltcMat !== undefined ) m_uniforms.ltcMat.value = THREE.UniformsLib.LTC_MAT_TEXTURE;
+			if ( m_uniforms.ltcMag !== undefined ) m_uniforms.ltcMag.value = THREE.UniformsLib.LTC_MAG_TEXTURE;
+
 			WebGLUniforms.upload(
 				_gl, materialProperties.uniformsList, m_uniforms, _this );