Function UpdateAreaLightUnits

BakingLab/AppSettings.cpp:823–876

    }

    static void UpdateAreaLightUnits()
    {
        static LightUnits prevUnits = AreaLightUnits;
        const LightUnits currUnits = AreaLightUnits;

        const float size = AreaLightSize;
        const float distance = AreaLightIlluminanceDistance;

        // Compute the luminance from our  currently active unit
        float luminance = AreaLightColor.Intensity();
        if(prevUnits == LightUnits::Illuminance)
        {
            float illuminance = AreaLightIlluminance;
            float angularRadius = std::atan2(size, distance);
            float integralFactor = IlluminanceIntegral(angularRadius);
            luminance = illuminance / integralFactor;
        }
        else if(prevUnits == LightUnits::LuminousPower)
        {
            float luminousPower = AreaLightLuminousPower;
            luminance = luminousPower / (4 * size * size * Pi * Pi);
        }
        else if(prevUnits == LightUnits::EV100)
        {
            float ev100 = AreaLightEV100;
            luminance = std::pow(2.0f, ev100 - 3.0f);
        }

        // Set the new luminance onto the color
        AreaLightColor.SetIntensity(luminance);

        // Update the other units
        float angularRadius = std::atan2(size, distance);
        float integralFactor = IlluminanceIntegral(angularRadius);
        float illuminance = luminance * integralFactor;
        AreaLightIlluminance.SetValue(illuminance);

        float luminousPower = luminance * (4 * size * size * Pi * Pi);
        AreaLightLuminousPower.SetValue(luminousPower);

        float ev100 = std::log2(luminance) + 3.0f;
        AreaLightEV100.SetValue(ev100);

        if(prevUnits != currUnits)
        {
            AreaLightColor.SetIntensityVisible(currUnits == LightUnits::Luminance);
            AreaLightIlluminance.SetVisible(currUnits == LightUnits::Illuminance);
            AreaLightLuminousPower.SetVisible(currUnits == LightUnits::LuminousPower);
            AreaLightEV100.SetVisible(currUnits == LightUnits::EV100);
            AreaLightIlluminanceDistance.SetVisible(currUnits == LightUnits::Illuminance);

            prevUnits = currUnits;
        }
    }

    void UpdateUI()
    {