// TODO: Support multiple intersection
public static bool ColourToPoint(Vector3 observer, Vector3 point, float searchDelay, bool ignoreCase1, bool ignoreCase2, out Color finalColour)
{
finalColour = Color.clear;
var gasGiants = SGT_CachedFind <SGT_GasGiant> .All(searchDelay);
foreach (var gasGiant in gasGiants)
{
if (gasGiant != null && gasGiant.atmosphereGameObject != null)
{
var oInside = gasGiant.InsideGasGiant(observer);
var pInside = gasGiant.InsideGasGiant(point);
// The gas giant itself will provide the colour in these cases
if (ignoreCase1 == true)
{
if (oInside == true && pInside == false)
{
continue;
}
}
if (ignoreCase2 == true)
{
if (oInside == false && pInside == false)
{
continue;
}
}
//var oblateFix = 1.0f / (1.0f - gasGiant.gasGiantOblateness);
var near = gasGiant.atmosphereGameObject.transform.InverseTransformPoint(observer);
var far = gasGiant.atmosphereGameObject.transform.InverseTransformPoint(point);
var far2 = far; // This is the actual far point on the gas giant's surface
var ray = (far - near).normalized;
if (oInside == false)
{
var dist = 0.0f;
if (SGT_Helper.IntersectRayToSphereA(near, ray, Vector3.zero, 1.0f, out dist) == false)
{
continue;
}
near = (near + ray * dist);
}
if (pInside == false)
{
var dist = 0.0f;
if (SGT_Helper.IntersectRayToSphereA(far, -ray, Vector3.zero, 1.0f, out dist) == false)
{
continue;
}
far = (far - ray * dist);
far2 = far;
}
else
{
var dist = 0.0f;
if (SGT_Helper.IntersectRayToSphereB(far, -ray, Vector3.zero, 1.0f, out dist) == false)
{
continue;
}
far2 = (far2 + ray * dist).normalized;
}
var polar = SGT_Helper.CartesianToPolarUV(near);
var nearDir = near.normalized;
var lightDir = gasGiant.atmosphereGameObject.transform.InverseTransformDirection(gasGiant.GasGiantLightSourceDirection);
var lightU = Vector3.Dot(nearDir, lightDir) * 0.5f + 0.5f;
var lightV = 1.0f - Vector3.Dot(ray, far2);
var day = gasGiant.SampleAtmosphereDay(polar);
var night = gasGiant.SampleAtmosphereNight(polar);
var lighting = gasGiant.SampleLighting(new Vector2(lightU, lightV));
var falloff = gasGiant.atmosphereDensityFalloff * gasGiant.atmosphereDensityFalloff;
var depthRatio = ((near - far).magnitude * gasGiant.gasGiantEquatorialRadius) / gasGiant.maxDepth;
var opticalDepth = Mathf.Pow(Mathf.Clamp01(SGT_Helper.Expose(depthRatio)), falloff);
finalColour = SGT_Helper.Lerp(night, day, lighting);
finalColour.a = opticalDepth;
return(true);
}
}
return(false);
}
