public void addColorTarget(FrameBufferTextureTarget colorBuf, TextureCubeMap.Face face) {
        // checkSetTexture(colorBuf.getTexture(), false);  // TODO: this won't work for levels.
        colorBuf.slot = colorBufs.size();
        colorBuf.face = face.ordinal();
        colorBufs.add(colorBuf);
    }
Adds a texture to one of the color Buffers Array. It uses {@link TextureCubeMap} ordinal number for the
position in the color buffer ArrayList.

@param colorBuf texture to add to the color Buffer
@param face position to add to the color buffer
jme3-core/src/main/java/com/jme3/texture/FrameBuffer.java