t',
            '10497' : 'repeat'
        };
        const regl = createREGL({
            canvas : canvas,
            extensions : [
                'OES_texture_float',
                'OES_element_index_uint',
                'OES_standard_derivatives',
                'EXT_shader_texture_lod'
            ]
        });

        const pickingVert = `
            attribute vec3 aPosition;
            uniform mat4 projViewMatrix;
            uniform mat4 modelMatrix;
            uniform mat4 positionMatri