flatLightDirection[2]);
webGLWrapper.uniform3f(shaderProgram
.getUniformLocation("directionalColor"), directionalColorRed,
directionalColorGreen, directionalColorBlue);
FloatMatrix4x4 normalMatrix = rotationMatrix.inverse();
normalMatrix = normalMatrix.transpose();
webGLWrapper.uniformMatrix4fv(shaderProgram
.getUniformLocation("normalMatrix"), false, normalMatrix
.getColumnWiseFlatData());
checkErrors();
webGLWrapper.drawArrays(PrimitiveRenderingMode.TRIANGLES, 0, 36);
checkErrors();