1 files changed, 86 insertions, 0 deletions
diff --git a/Runtime/Utilities/LODUtility.cpp b/Runtime/Utilities/LODUtility.cpp
new file mode 100644
index 0000000..d2268fb
--- /dev/null
+++ b/Runtime/Utilities/LODUtility.cpp
@@ -0,0 +1,86 @@
+#include "UnityPrefix.h"
+
+#include "LODUtility.h"
+#include "Runtime/Filters/Renderer.h"
+#include "Runtime/Math/Vector3.h"
+#include "Runtime/Camera/LODGroup.h"
+#include "Runtime/Filters/AABBUtility.h"
+#include "Runtime/Camera/LODGroupManager.h"
+
+void CalculateLODGroupBoundingBox ( LODGroup& group )
+{
+	Matrix4x4f worldToLocal = group.GetComponent(Transform).GetWorldToLocalMatrix();
+	
+	MinMaxAABB minmax;
+	minmax.Init();
+	for (int i=0;i<group.GetLODCount();i++)
+	{
+		for (int r=0;r<group.GetLOD(i).renderers.size();r++)
+		{
+			Renderer* renderer = group.GetLOD(i).renderers[r].renderer;
+			if (renderer && renderer->GetGameObjectPtr())
+			{
+				AABB localBounds;
+				if (CalculateLocalAABB (renderer->GetGameObject(), &localBounds))
+				{
+					Matrix4x4f relativeTransform;
+					Matrix4x4f rendererLocalToWorld = renderer->GetTransform().GetLocalToWorldMatrix();
+					
+					MultiplyMatrices4x4(&worldToLocal, &rendererLocalToWorld, &relativeTransform);
+					
+					AABB lodGroupRelativeBoundds;
+					TransformAABBSlow (localBounds, relativeTransform, lodGroupRelativeBoundds);
+
+					minmax.Encapsulate(lodGroupRelativeBoundds);
+				}
+			}
+		}
+	}
+	
+	float size;
+	if (minmax.IsValid())	
+	{
+		group.SetLocalReferencePoint (minmax.GetCenter());
+		Vector3f extent = minmax.GetExtent() * 2.0F;
+		size = std::max(std::max(extent.x, extent.y), extent.z);
+	}
+	else
+	{
+		group.SetLocalReferencePoint (Vector3f (0, 0, 0));
+		size = 1;
+	}
+	
+	float scale = group.GetWorldSpaceScale();
+	if (scale > 0.0001F)
+		size /= scale;
+
+	group.SetSize (size);
+}
+
+void ForceLODLevel (const LODGroup& group, int index)
+{
+	int LODCount = group.GetLODCount();
+	if (index >= LODCount)
+	if (index >= LODCount)
+	{
+		WarningString("SetLODs: Attempting to force a LOD outside the number available LODs");
+		return;
+	}
+
+	// mask of 0 = no force
+	// now create a mask for the rest
+	UInt32 lodMask = 0;
+	if (index >= 0)
+		lodMask = 1 << index;
+
+	LODGroupManager& m = GetLODGroupManager();
+	int lodGroupIndex = group.GetLODGroup();
+	if (lodGroupIndex < 0)
+	{
+		WarningString("SetLODs: Attempting to force a LOD outside the number available LODs");
+		return;
+	}
+
+	m.SetForceLODMask (lodGroupIndex, lodMask);
+}
+