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Improve the light attenuation formulae

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This commit is contained in:
Sam Gateau 2015-08-21 16:28:38 -07:00
parent 66087872a3
commit 518cf3be15
2 changed files with 11 additions and 2 deletions
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11
libraries/model/src/model/Light.cpp
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@ -58,10 +58,12 @@ const Vec3& Light::getDirection() const {
void Light::setColor(const Color& color) {
editSchema()._color = color;
updateLightRadius();
}
void Light::setIntensity(float intensity) {
editSchema()._intensity = intensity;
updateLightRadius();
}
void Light::setAmbientIntensity(float intensity) {
@ -72,9 +74,14 @@ void Light::setMaximumRadius(float radius) {
if (radius <= 0.f) {
radius = 1.0f;
}
editSchema()._attenuation.w = radius;
updateLightRadius();
}
void Light::updateLightRadius() {
float CutOffIntensityRatio = 0.05f;
float surfaceRadius = radius / (sqrtf(1.0f / CutOffIntensityRatio) - 1.0f);
editSchema()._attenuation = Vec4(surfaceRadius, 1.0f/surfaceRadius, CutOffIntensityRatio, radius);
float surfaceRadius = getMaximumRadius() / (sqrtf((getIntensity() * std::max(std::max(getColor().x, getColor().y), getColor().z)) / CutOffIntensityRatio) - 1.0f);
editSchema()._attenuation = Vec4(surfaceRadius, 1.0f/surfaceRadius, CutOffIntensityRatio, getMaximumRadius());
}
#include <math.h>

2
libraries/model/src/model/Light.h
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@ -127,6 +127,8 @@ protected:
const Schema& getSchema() const { return _schemaBuffer.get<Schema>(); }
Schema& editSchema() { return _schemaBuffer.edit<Schema>(); }
void updateLightRadius();
};
typedef std::shared_ptr< Light > LightPointer;