bool CheckGrassDistance(UTreeGroup group, Vector3 position, float density)
{
foreach (UTreeInstance ins in group.instances)
{
if ((ins.position - position).magnitude < density)
{
return(false);
}
}
return(true);
}
void DrawTrees(UTreeGroup group, Camera camera)
{
float start = m_Terrain.data.treeBillBoardStart;
Vector3 pos = camera.transform.position - group.transform.position;
Vector3 center = group.center;
Vector3 proPos = new Vector3(pos.x, center.y, pos.z);
if (Vector3.Distance(center, proPos) - m_MaxRadius < start)
{
group.instances.ToList().ForEach(ins => {
ins.active = Vector3.Distance(ins.position, pos) < start;
});
}
}
public void AddArea(Vector3 pos, Vector3 scale, float density)
{
UTreeInstance instance = new UTreeInstance(pos, scale, m_TreeMesh.bounds.size);
int groupIndex = GetGroupIndex(instance);
UTreeGroup group = m_Groups[groupIndex];
if (CheckGrassDistance(group, instance.position, density))
{
group.Add(instance);
if (!m_ApplyGroup.Contains(groupIndex))
{
m_ApplyGroup.Add(groupIndex);
}
}
}
int GetGroupIndex(UTreeInstance instance)
{
int index = -1;
for (int i = 0; i < m_Groups.Count; i++)
{
UTreeGroup g = m_Groups[i];
if (Vector3.Distance(instance.position, g.center) < m_MaxRadius && g.length < m_MaxVector)
{
index = i;
break;
}
}
if (index == -1)
{
m_Groups.Add(new UTreeGroup(this, instance));
index = m_Groups.Count - 1;
if (!m_ApplyGroup.Contains(index))
{
m_ApplyGroup.Add(index);
}
}
return(index);
}