TAUMP's post in Shadow system was marked as the answer
bool CPythonBackground::SetShadowLevel(int eLevel)
{
if (!m_pkMap)
return false;
if (m_eShadowLevel == eLevel)
return true;
CMapOutdoor& rkMap = GetMapOutdoorRef();
m_eShadowLevel = eLevel;
switch (m_eShadowLevel)
{
case SHADOW_NONE:
rkMap.SetDrawShadow(false);
rkMap.SetShadowTextureSize(512);
break;
case SHADOW_GROUND:
rkMap.SetDrawShadow(true);
rkMap.SetDrawCharacterShadow(false);
rkMap.SetShadowTextureSize(1024);
break;
case SHADOW_GROUND_AND_SOLO:
rkMap.SetDrawShadow(true);
rkMap.SetDrawCharacterShadow(true);
rkMap.SetShadowTextureSize(2048);
break;
case SHADOW_ALL:
rkMap.SetDrawShadow(true);
rkMap.SetDrawCharacterShadow(true);
rkMap.SetShadowTextureSize(2048);
break;
case SHADOW_ALL_HIGH:
rkMap.SetDrawShadow(true);
rkMap.SetDrawCharacterShadow(true);
rkMap.SetShadowTextureSize(4096);
break;
case SHADOW_ALL_MAX:
rkMap.SetDrawShadow(true);
rkMap.SetDrawCharacterShadow(true);
rkMap.SetShadowTextureSize(4096);
break;
}
return true;
}