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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/

pull/2434/head
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();
}

5
code/BlenderScene.cpp
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@ -211,9 +211,12 @@ template <> void Structure :: Convert<Lamp> (
ReadField<ErrorPolicy_Warn>(dest.b,"b",db);
ReadField<ErrorPolicy_Warn>(dest.k,"k",db);
ReadField<ErrorPolicy_Igno>(dest.energy,"energy",db);
ReadField<ErrorPolicy_Igno>(dest.dist,"dist",db);
ReadField<ErrorPolicy_Warn>(dest.dist,"dist",db);
ReadField<ErrorPolicy_Igno>(dest.spotsize,"spotsize",db);
ReadField<ErrorPolicy_Igno>(dest.spotblend,"spotblend",db);
ReadField<ErrorPolicy_Warn>(dest.constant_coefficient, "coeff_const", db);
ReadField<ErrorPolicy_Warn>(dest.linear_coefficient, "coeff_lin", db);
ReadField<ErrorPolicy_Warn>(dest.quadratic_coefficient, "coeff_quad", db);
ReadField<ErrorPolicy_Igno>(dest.att1,"att1",db);
ReadField<ErrorPolicy_Igno>(dest.att2,"att2",db);
ReadField<ErrorPolicy_Igno>(temp,"falloff_type",db);

4
code/BlenderScene.h
View File

@ -538,6 +538,10 @@ struct Lamp : ElemBase {
float energy, dist, spotsize, spotblend;
//float haint;
float constant_coefficient;
float linear_coefficient;
float quadratic_coefficient;
float att1, att2;
//struct CurveMapping *curfalloff;
FalloffType falloff_type;