private void SetDecimation(float value, Dictionary <string, float> variables)
{
ConnectedMesh[] connectedMeshes = _originalMeshes.Select(x => UnityConverter.ToSharedMesh(x).ToConnectedMesh()).ToArray();
foreach (ConnectedMesh connectedMesh in connectedMeshes)
{
for (int i = 0; i < connectedMesh.attributeDefinitions.Length; i++)
{
switch (connectedMesh.attributeDefinitions[i].type)
{
case AttributeType.Normals:
connectedMesh.attributeDefinitions[i].weight = variables["NormalWeight"];
break;
case AttributeType.UVs:
connectedMesh.attributeDefinitions[i].weight = variables["UVsWeight"];
break;
}
}
}
foreach (ConnectedMesh connectedMesh in connectedMeshes)
{
// Important step :
// We merge positions to increase chances of having correct topology information
// We merge attributes in order to make interpolation properly operate on every face
connectedMesh.MergePositions(0.0001f /*variables["MergeThreshold"]*/);
connectedMesh.MergeAttributes();
connectedMesh.Compact();
}
DecimateModifier.MergeNormalsThresholdDegrees = variables["MergeNormalsThreshold"];
//DecimateModifier.UpdateFarNeighbors = variables["UpdateFarNeighbors"] > 0.5;
//DecimateModifier.UpdateMinsOnCollapse = variables["UpdateMinsOnCollapse"] > 0.5;
//DecimateModifier.UseEdgeLength = variables["UseEdgeLength"] > 0.5;
DecimateModifier.CollapseToMidpointPenalty = variables["CollapseToMidpointPenalty"];
ConnectedMesh.EdgeBorderPenalty = variables["EdgeBorderPenalty"];
SceneDecimator sceneDecimator = new SceneDecimator();
sceneDecimator.Initialize(connectedMeshes);
sceneDecimator.DecimateToRatio(value);
for (int i = 0; i < connectedMeshes.Length; i++)
{
_meshes[i].Clear();
connectedMeshes[i].ToSharedMesh().ToUnityMesh(_meshes[i]);
_meshes[i].bindposes = _originalMeshes[i].bindposes;
}
}
private void OnValueChanged(float value)
{
polycountLabel.text = $"{Math.Round(100 * value)}% ({Math.Round(value * _polycount)}/{_polycount} triangles)";
Profiling.Start("Convert");
var connectedMeshes = _originalMeshes.Select(x => UnityConverter.ToSharedMesh(x).ToConnectedMesh()).ToArray();
Debug.Log(Profiling.End("Convert"));
Profiling.Start("Clean");
foreach (var connectedMesh in connectedMeshes)
{
// Important step :
// We merge positions to increase chances of having correct topology information
// We merge attributes in order to make interpolation properly operate on every face
connectedMesh.MergePositions(0.0001f);
connectedMesh.MergeAttributes();
connectedMesh.Compact();
}
Debug.Log(Profiling.End("Clean"));
Profiling.Start("Decimate");
SceneDecimator sceneDecimator = new SceneDecimator();
sceneDecimator.Initialize(connectedMeshes);
sceneDecimator.DecimateToRatio(value);
Debug.Log(Profiling.End("Decimate"));
Profiling.Start("Convert back");
for (int i = 0; i < connectedMeshes.Length; i++)
{
_meshes[i].Clear();
connectedMeshes[i].ToSharedMesh().ToUnityMesh(_meshes[i]);
_meshes[i].bindposes = _originalMeshes[i].bindposes;
}
Debug.Log(Profiling.End("Convert back"));
}
public static void GenerateLODs(LODGroup lodGroup, HashSet <Mesh> newMeshes = null)
{
LOD[] lods = lodGroup.GetLODs();
// Cleanup
for (int i = 1; i < lods.Length; i++)
{
foreach (Renderer renderer in lods[i].renderers)
{
if (renderer != null)
{
Object.DestroyImmediate(renderer.gameObject);
}
}
}
if (newMeshes == null)
{
newMeshes = new HashSet <Mesh>();
}
// Assign LOD0
Renderer[] renderers = lodGroup.GetComponentsInChildren <Renderer>();
lods[0].renderers = renderers;
Dictionary <Mesh, ConnectedMesh> uniqueMeshes = new Dictionary <Mesh, ConnectedMesh>();
foreach (Renderer renderer in renderers)
{
if (renderer is MeshRenderer meshRenderer)
{
MeshFilter meshFilter = renderer.gameObject.GetComponent <MeshFilter>();
if (meshFilter)
{
Mesh mesh = meshFilter.sharedMesh;
if (!uniqueMeshes.ContainsKey(mesh))
{
uniqueMeshes.TryAdd(mesh, m => UnityConverter.ToSharedMesh(m).ToConnectedMesh());
}
}
}
else if (renderer is SkinnedMeshRenderer skinnedMeshRenderer)
{
Mesh mesh = skinnedMeshRenderer.sharedMesh;
if (!uniqueMeshes.ContainsKey(mesh))
{
uniqueMeshes.TryAdd(mesh, m => UnityConverter.ToSharedMesh(m).ToConnectedMesh());
}
}
}
foreach (KeyValuePair <Mesh, ConnectedMesh> uniqueMesh in uniqueMeshes)
{
uniqueMesh.Value.MergePositions(0.0001);
uniqueMesh.Value.MergeAttributes();
uniqueMesh.Value.Compact();
}
SceneDecimator sceneDecimator = new SceneDecimator();
sceneDecimator.Initialize(uniqueMeshes.Values);
// Build LODs
for (int i = 1; i < lods.Length; i++)
{
// Decimates gradually
sceneDecimator.DecimateToRatio(lods[i - 1].screenRelativeTransitionHeight);
Dictionary <Mesh, Mesh> optimizedMeshes = uniqueMeshes.ToDictionary(x => x.Key, x => x.Value.ToSharedMesh().ToUnityMesh());
List <Renderer> lodRenderers = new List <Renderer>();
foreach (Renderer renderer in renderers)
{
if (renderer is MeshRenderer meshRenderer)
{
MeshFilter meshFilter = renderer.gameObject.GetComponent <MeshFilter>();
if (meshFilter)
{
GameObject gameObject = new GameObject(renderer.gameObject.name + "_LOD" + i);
gameObject.transform.parent = renderer.transform;
gameObject.transform.localPosition = UnityEngine.Vector3.zero;
gameObject.transform.localRotation = UnityEngine.Quaternion.identity;
gameObject.transform.localScale = UnityEngine.Vector3.one;
MeshRenderer mr = gameObject.AddComponent <MeshRenderer>();
MeshFilter mf = gameObject.AddComponent <MeshFilter>();
Mesh originalMesh = meshFilter.sharedMesh;
Mesh optimizedMesh = optimizedMeshes[originalMesh]; // Todo : Don't create new mesh if it's the same (tri count);
optimizedMesh.name = originalMesh.name + "_LOD" + i;
mr.sharedMaterials = meshRenderer.sharedMaterials;
mf.sharedMesh = optimizedMesh;
newMeshes.Add(optimizedMesh);
lodRenderers.Add(mr);
}
}
else if (renderer is SkinnedMeshRenderer skinnedMeshRenderer)
{
GameObject gameObject = new GameObject(renderer.gameObject.name + "_LOD" + i);
gameObject.transform.parent = renderer.transform;
gameObject.transform.localPosition = UnityEngine.Vector3.zero;
gameObject.transform.localRotation = UnityEngine.Quaternion.identity;
gameObject.transform.localScale = UnityEngine.Vector3.one;
SkinnedMeshRenderer smr = gameObject.AddComponent <SkinnedMeshRenderer>();
smr.bones = skinnedMeshRenderer.bones;
smr.rootBone = skinnedMeshRenderer.rootBone;
Mesh originalMesh = skinnedMeshRenderer.sharedMesh;
Mesh optimizedMesh = optimizedMeshes[originalMesh]; // Todo : Don't create new mesh if it's the same (tri count);
optimizedMesh.name = originalMesh.name + "_LOD" + i;
smr.sharedMaterials = skinnedMeshRenderer.sharedMaterials;
smr.sharedMesh = optimizedMesh;
optimizedMesh.bindposes = originalMesh.bindposes; // Copy poses
newMeshes.Add(optimizedMesh);
lodRenderers.Add(smr);
}
}
///Debug.Log($"LOD{i} created with {lodRenderers.Count} renderers at {100f * lods[i - 1].screenRelativeTransitionHeight}% poly ratio");
lods[i].renderers = lodRenderers.ToArray();
}
lodGroup.SetLODs(lods);
}