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Generate attenuation constants if non are privded in the Blender file. Using: https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/

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Martin Vorbrodt
2019-04-24 18:35:14 -04:00
parent 36bce5fa00
commit e83671f494
3 changed files with 35 additions and 1 deletions
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27
code/BlenderLoader.cpp
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@@ -1225,6 +1225,16 @@ aiLight* BlenderImporter::ConvertLight(const Scene& /*in*/, const Object* obj, c
case Lamp::Type_Local:
out->mType = aiLightSource_POINT;
break;
case Lamp::Type_Spot:
out->mType = aiLightSource_SPOT;
// blender orients directional lights as facing toward -z
out->mDirection = aiVector3D(0.f, 0.f, -1.f);
out->mUp = aiVector3D(0.f, 1.f, 0.f);
out->mAngleInnerCone = lamp->spotsize * (1.0f - lamp->spotblend);
out->mAngleOuterCone = lamp->spotsize;
break;
case Lamp::Type_Sun:
out->mType = aiLightSource_DIRECTIONAL;
@@ -1255,6 +1265,23 @@ aiLight* BlenderImporter::ConvertLight(const Scene& /*in*/, const Object* obj, c
out->mColorAmbient = aiColor3D(lamp->r, lamp->g, lamp->b) * lamp->energy;
out->mColorSpecular = aiColor3D(lamp->r, lamp->g, lamp->b) * lamp->energy;
out->mColorDiffuse = aiColor3D(lamp->r, lamp->g, lamp->b) * lamp->energy;
// If default values are supplied, compute the coefficients from light's max distance
// Read this: https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/
//
if (lamp->constant_coefficient == 1.0f && lamp->linear_coefficient == 0.0f && lamp->quadratic_coefficient == 0.0f && lamp->dist > 0.0f)
{
out->mAttenuationConstant = 1.0f;
out->mAttenuationLinear = 2.0f / lamp->dist;
out->mAttenuationQuadratic = 1.0f / (lamp->dist * lamp->dist);
}
else
{
out->mAttenuationConstant = lamp->constant_coefficient;
out->mAttenuationLinear = lamp->linear_coefficient;
out->mAttenuationQuadratic = lamp->quadratic_coefficient;
}
return out.release();
}