shaderLightingPass.setVec3("lights[" + std::to_string(i) + "].Position", lightPositions[i]);
            shaderLightingPass.setVec3("lights[" + std::to_string(i) + "].Color", lightColors[i]);
            // update attenuation parameters and calculate radius
            const float constant = 1.0; // note that we don't send this to the shader, we assume it is always 1.0 (in our case)
            const float linear = 0.7;
            const float quadratic = 1.8;
            shaderLightingPass.setFloat("lights[" + std::to_string(i) + "].Linear", linear);
            shaderLightingPass.setFloat("lights[" + std::to_string(i) + "].Quadratic", quadratic);
            // then calculate radius of light volume/sphere
            const float maxBrightness = std::fmaxf(std::fmaxf(lightColors[i].r, lightColors[i].g), lightColors[i].b);
            float radius = (-linear + std::sqrt(linear * linear - 4 * quadratic * (constant - (256.0f / 5.0f) * maxBrightness))) / (2.0f * quadratic);
            shaderLightingPass.setFloat("lights[" + std::to_string(i) + "].Radius", radius);