Method evalG2

src/testrender/shading.cpp:524–527

    }

    static float evalG2(float Lambda_i, float Lambda_o) {
    	// correlated masking-shadowing
        return 1 / (Lambda_i + Lambda_o + 1);
    }

    static float evalG1(float Lambda_v) {
        return 1 / (Lambda_v + 1);