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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "SkyLight.h"
#include "Map/MapInfo.h"
#include "System/FastMath.h"
ISkyLight::ISkyLight() {
SetLightDir(mapInfo->light.sunDir);
}
float3& ISkyLight::CalcPolarLightDir() {
lightDirZ = lightDir;
lightDirZ.y = 0.0f;
if (lightDirZ.SqLength() == 0.0f)
lightDirZ.x = 1.0f;
lightDirZ.ANormalize();
lightDirX = lightDirZ.cross(UpVector);
// polar-coordinate direction in yz-plane (sin(zenith-angle), radius)
modLightDir.x = 0.0f;
modLightDir.y = lightDir.y;
modLightDir.z = fastmath::sqrt_sse(lightDir.dot2D(lightDir));
return modLightDir;
}
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