public static bool GenerateMeshUsingGeoCache(HEU_SessionBase session, HEU_HoudiniAsset asset, GameObject gameObject,
HEU_GenerateGeoCache geoCache, bool bGenerateUVs, bool bGenerateTangents, bool bPartInstanced)
{
#if HEU_PROFILER_ON
float generateMeshTime = Time.realtimeSinceStartup;
#endif
string collisionGroupName = HEU_PluginSettings.CollisionGroupName;
string renderCollisionGroupName = HEU_PluginSettings.RenderedCollisionGroupName;
// Stores submesh data based on material key (ie. a submesh for each unique material)
// Unity requires that if using multiple materials in the same GameObject, then we
// need to create corresponding number of submeshes as materials.
// So we'll create a submesh for each material in use.
// Each submesh will have a list of vertices and their attributes which
// we'll collect in a helper class (HEU_MeshData).
// Once we collected all the submesh data, we create a CombineInstance for each
// submesh, then combine it while perserving the submeshes.
Dictionary<int, HEU_MeshData> subMeshesMap = new Dictionary<int, HEU_MeshData>();
string defaultMaterialName = HEU_HoudiniAsset.GenerateDefaultMaterialName(geoCache.GeoID, geoCache.PartID);
int defaultMaterialKey = HEU_MaterialFactory.MaterialNameToKey(defaultMaterialName);
int singleFaceUnityMaterialKey = HEU_Defines.HEU_INVALID_MATERIAL;
int singleFaceHoudiniMaterialKey = HEU_Defines.HEU_INVALID_MATERIAL;
// Now go through each group data and acquire the vertex data.
// We'll create the collider mesh rightaway and assign to the gameobject.
int numCollisionMeshes = 0;
foreach (KeyValuePair<string, int[]> groupSplitFacesPair in geoCache._groupSplitVertexIndices)
{
string groupName = groupSplitFacesPair.Key;
int[] groupVertexList = groupSplitFacesPair.Value;
bool bIsCollidable = groupName.Contains(collisionGroupName);
bool bIsRenderCollidable = groupName.Contains(renderCollisionGroupName);
if (bIsCollidable || bIsRenderCollidable)
{
if (numCollisionMeshes > 0)
{
Debug.LogWarningFormat("More than 1 collision mesh detected for part {0}.\nOnly a single collision mesh is supported per part.", geoCache._partName);
}
if (geoCache._partInfo.type == HAPI_PartType.HAPI_PARTTYPE_BOX)
{
// Box collider
HAPI_BoxInfo boxInfo = new HAPI_BoxInfo();
if (session.GetBoxInfo(geoCache.GeoID, geoCache.PartID, ref boxInfo))
{
BoxCollider boxCollider = HEU_GeneralUtility.GetOrCreateComponent<BoxCollider>(gameObject);
boxCollider.center = new Vector3(-boxInfo.center[0], boxInfo.center[1], boxInfo.center[2]);
boxCollider.size = new Vector3(boxInfo.size[0] * 2f, boxInfo.size[1] * 2f, boxInfo.size[2] * 2f);
// TODO: Should we apply the box info rotation here to the box collider?
// If so, it should be in its own gameobject?
}
}
else if (geoCache._partInfo.type == HAPI_PartType.HAPI_PARTTYPE_SPHERE)
{
// Sphere collider
HAPI_SphereInfo sphereInfo = new HAPI_SphereInfo();
if (session.GetSphereInfo(geoCache.GeoID, geoCache.PartID, ref sphereInfo))
{
SphereCollider sphereCollider = HEU_GeneralUtility.GetOrCreateComponent<SphereCollider>(gameObject);
sphereCollider.center = new Vector3(-sphereInfo.center[0], sphereInfo.center[1], sphereInfo.center[2]);
sphereCollider.radius = sphereInfo.radius;
}
}
else
{
// Mesh collider
List<Vector3> collisionVertices = new List<Vector3>();
for (int v = 0; v < groupVertexList.Length; ++v)
{
int index = groupVertexList[v];
if (index >= 0 && index < geoCache._posAttr.Length)
{
collisionVertices.Add(new Vector3(-geoCache._posAttr[index * 3], geoCache._posAttr[index * 3 + 1], geoCache._posAttr[index * 3 + 2]));
}
}
int[] collisionIndices = new int[collisionVertices.Count];
for (int i = 0; i < collisionIndices.Length; ++i)
{
collisionIndices[i] = i;
}
Mesh collisionMesh = new Mesh();
#if UNITY_2017_3_OR_NEWER
collisionMesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
#endif
collisionMesh.name = groupName;
collisionMesh.vertices = collisionVertices.ToArray();
collisionMesh.triangles = collisionIndices;
collisionMesh.RecalculateBounds();
MeshCollider meshCollider = HEU_GeneralUtility.GetOrCreateComponent<MeshCollider>(gameObject);
meshCollider.sharedMesh = collisionMesh;
}
numCollisionMeshes++;
}
if (bIsCollidable && !bIsRenderCollidable)
{
continue;
}
// After this point, we'll be only processing renderable geometry
// Transfer indices for each attribute from the single large list into group lists
float[] groupColorAttr = new float[0];
HEU_GenerateGeoCache.TransferRegularPointAttributesToVertices(groupVertexList, ref geoCache._colorAttrInfo, geoCache._colorAttr, ref groupColorAttr);
float[] groupAlphaAttr = new float[0];
HEU_GenerateGeoCache.TransferRegularPointAttributesToVertices(groupVertexList, ref geoCache._alphaAttrInfo, geoCache._alphaAttr, ref groupAlphaAttr);
float[] groupNormalAttr = new float[0];
HEU_GenerateGeoCache.TransferRegularPointAttributesToVertices(groupVertexList, ref geoCache._normalAttrInfo, geoCache._normalAttr, ref groupNormalAttr);
float[] groupTangentsAttr = new float[0];
HEU_GenerateGeoCache.TransferRegularPointAttributesToVertices(groupVertexList, ref geoCache._tangentAttrInfo, geoCache._tangentAttr, ref groupTangentsAttr);
float[] groupUVAttr = new float[0];
HEU_GenerateGeoCache.TransferRegularPointAttributesToVertices(groupVertexList, ref geoCache._uvAttrInfo, geoCache._uvAttr, ref groupUVAttr);
float[] groupUV2Attr = new float[0];
HEU_GenerateGeoCache.TransferRegularPointAttributesToVertices(groupVertexList, ref geoCache._uv2AttrInfo, geoCache._uv2Attr, ref groupUV2Attr);
float[] groupUV3Attr = new float[0];
HEU_GenerateGeoCache.TransferRegularPointAttributesToVertices(groupVertexList, ref geoCache._uv3AttrInfo, geoCache._uv3Attr, ref groupUV3Attr);
// Unity mesh creation requires # of vertices must equal # of attributes (color, normal, uvs).
// HAPI gives us point indices. Since our attributes are via vertex, we need to therefore
// create new indices of vertices that correspond to our attributes.
// To reindex, we go through each index, add each attribute corresponding to that index to respective lists.
// Then we set the index of where we added those attributes as the new index.
int numIndices = groupVertexList.Length;
for (int vertexIndex = 0; vertexIndex < numIndices; vertexIndex += 3)
{
// groupVertexList contains -1 for unused indices, and > 0 for used
if (groupVertexList[vertexIndex] == -1)
{
continue;
}
int faceIndex = vertexIndex / 3;
int faceMaterialID = geoCache._houdiniMaterialIDs[faceIndex];
// Get the submesh ID for this face. Depends on whether it is a Houdini or Unity material.
// Using default material as failsafe
int submeshID = HEU_Defines.HEU_INVALID_MATERIAL;
if (geoCache._unityMaterialAttrInfo.exists)
{
// This face might have a Unity or Substance material attribute.
// Formulate the submesh ID by combining the material attributes.
if (geoCache._singleFaceUnityMaterial)
{
if (singleFaceUnityMaterialKey == HEU_Defines.HEU_INVALID_MATERIAL && geoCache._unityMaterialInfos.Count > 0)
{
// Use first material
var unityMaterialMapEnumerator = geoCache._unityMaterialInfos.GetEnumerator();
if (unityMaterialMapEnumerator.MoveNext())
{
singleFaceUnityMaterialKey = unityMaterialMapEnumerator.Current.Key;
}
}
submeshID = singleFaceUnityMaterialKey;
}
else
{
int attrIndex = faceIndex;
if (geoCache._unityMaterialAttrInfo.owner == HAPI_AttributeOwner.HAPI_ATTROWNER_PRIM || geoCache._unityMaterialAttrInfo.owner == HAPI_AttributeOwner.HAPI_ATTROWNER_POINT)
{
if (geoCache._unityMaterialAttrInfo.owner == HAPI_AttributeOwner.HAPI_ATTROWNER_POINT)
{
attrIndex = groupVertexList[vertexIndex];
}
string unityMaterialName = "";
string substanceName = "";
int substanceIndex = -1;
submeshID = HEU_GenerateGeoCache.GetMaterialKeyFromAttributeIndex(geoCache, attrIndex, out unityMaterialName, out substanceName, out substanceIndex);
}
else
{
// (geoCache._unityMaterialAttrInfo.owner == HAPI_AttributeOwner.HAPI_ATTROWNER_DETAIL) should have been handled as geoCache._singleFaceMaterial above
Debug.LogErrorFormat("Unity material attribute not supported for attribute type {0}!", geoCache._unityMaterialAttrInfo.owner);
}
}
}
if (submeshID == HEU_Defines.HEU_INVALID_MATERIAL)
{
// Check if has Houdini material assignment
if (geoCache._houdiniMaterialIDs.Length > 0)
{
if (geoCache._singleFaceHoudiniMaterial)
{
if (singleFaceHoudiniMaterialKey == HEU_Defines.HEU_INVALID_MATERIAL)
{
singleFaceHoudiniMaterialKey = geoCache._houdiniMaterialIDs[0];
}
submeshID = singleFaceHoudiniMaterialKey;
}
else if (faceMaterialID > 0)
{
submeshID = faceMaterialID;
}
}
if (submeshID == HEU_Defines.HEU_INVALID_MATERIAL)
{
// Use default material
submeshID = defaultMaterialKey;
}
}
if (!subMeshesMap.ContainsKey(submeshID))
{
// New submesh
subMeshesMap.Add(submeshID, new HEU_MeshData());
}
HEU_MeshData subMeshData = subMeshesMap[submeshID];
for (int triIndex = 0; triIndex < 3; ++triIndex)
{
int vertexTriIndex = vertexIndex + triIndex;
int positionIndex = groupVertexList[vertexTriIndex];
// Position
Vector3 position = new Vector3(-geoCache._posAttr[positionIndex * 3 + 0], geoCache._posAttr[positionIndex * 3 + 1], geoCache._posAttr[positionIndex * 3 + 2]);
subMeshData._vertices.Add(position);
// Color
if (geoCache._colorAttrInfo.exists)
{
Color tempColor = new Color();
tempColor.r = Mathf.Clamp01(groupColorAttr[vertexTriIndex * geoCache._colorAttrInfo.tupleSize + 0]);
tempColor.g = Mathf.Clamp01(groupColorAttr[vertexTriIndex * geoCache._colorAttrInfo.tupleSize + 1]);
tempColor.b = Mathf.Clamp01(groupColorAttr[vertexTriIndex * geoCache._colorAttrInfo.tupleSize + 2]);
if (geoCache._alphaAttrInfo.exists)
{
tempColor.a = Mathf.Clamp01(groupAlphaAttr[vertexTriIndex]);
}
else if (geoCache._colorAttrInfo.tupleSize == 4)
{
tempColor.a = Mathf.Clamp01(groupColorAttr[vertexTriIndex * geoCache._colorAttrInfo.tupleSize + 3]);
}
else
{
tempColor.a = 1f;
}
subMeshData._colors.Add(tempColor);
}
else
{
subMeshData._colors.Add(Color.white);
}
// Normal
if (vertexTriIndex < groupNormalAttr.Length)
{
// Flip the x
Vector3 normal = new Vector3(-groupNormalAttr[vertexTriIndex * 3 + 0], groupNormalAttr[vertexTriIndex * 3 + 1], groupNormalAttr[vertexTriIndex * 3 + 2]);
subMeshData._normals.Add(normal);
}
else
{
// We'll be calculating normals later
subMeshData._normals.Add(Vector3.zero);
}
// UV1
if (vertexTriIndex < groupUVAttr.Length)
{
Vector2 uv = new Vector2(groupUVAttr[vertexTriIndex * 2 + 0], groupUVAttr[vertexTriIndex * 2 + 1]);
subMeshData._UVs.Add(uv);
}
// UV2
if (vertexTriIndex < groupUV2Attr.Length)
{
Vector2 uv = new Vector2(groupUV2Attr[vertexTriIndex * 2 + 0], groupUV2Attr[vertexTriIndex * 2 + 1]);
subMeshData._UV2s.Add(uv);
}
// UV3
if (vertexTriIndex < groupUV3Attr.Length)
{
Vector2 uv = new Vector2(groupUV3Attr[vertexTriIndex * 2 + 0], groupUV3Attr[vertexTriIndex * 2 + 1]);
subMeshData._UV3s.Add(uv);
}
// Tangents
if (bGenerateTangents && vertexTriIndex < groupTangentsAttr.Length)
{
Vector4 tangent = Vector4.zero;
if (geoCache._tangentAttrInfo.tupleSize == 4)
{
tangent = new Vector4(-groupTangentsAttr[vertexTriIndex * 4 + 0], groupTangentsAttr[vertexTriIndex * 4 + 1], groupTangentsAttr[vertexTriIndex * 4 + 2], groupTangentsAttr[vertexTriIndex * 4 + 3]);
}
else if (geoCache._tangentAttrInfo.tupleSize == 3)
{
tangent = new Vector4(-groupTangentsAttr[vertexTriIndex * 3 + 0], groupTangentsAttr[vertexTriIndex * 3 + 1], groupTangentsAttr[vertexTriIndex * 3 + 2], 1);
}
subMeshData._tangents.Add(tangent);
}
subMeshData._indices.Add(subMeshData._vertices.Count - 1);
//Debug.LogFormat("Submesh index mat {0} count {1}", faceMaterialID, subMeshData._indices.Count);
}
if (!geoCache._normalAttrInfo.exists)
{
// To generate normals after all the submeshes have been defined, we
// calculate and store each triangle normal, along with the list
// of connected vertices for each vertex
int triIndex = subMeshData._indices.Count - 3;
int i1 = subMeshData._indices[triIndex + 0];
int i2 = subMeshData._indices[triIndex + 1];
int i3 = subMeshData._indices[triIndex + 2];
// Triangle normal
Vector3 p1 = subMeshData._vertices[i2] - subMeshData._vertices[i1];
Vector3 p2 = subMeshData._vertices[i3] - subMeshData._vertices[i1];
Vector3 normal = Vector3.Cross(p1, p2).normalized;
subMeshData._triangleNormals.Add(normal);
int normalIndex = subMeshData._triangleNormals.Count - 1;
// Connected vertices
geoCache._sharedNormalIndices[groupVertexList[vertexIndex + 0]].Add(new VertexEntry(submeshID, i1, normalIndex));
geoCache._sharedNormalIndices[groupVertexList[vertexIndex + 1]].Add(new VertexEntry(submeshID, i2, normalIndex));
geoCache._sharedNormalIndices[groupVertexList[vertexIndex + 2]].Add(new VertexEntry(submeshID, i3, normalIndex));
}
}
}
int numSubmeshes = subMeshesMap.Keys.Count;
bool bGenerated = false;
if (numSubmeshes > 0)
{
if (!geoCache._normalAttrInfo.exists)
{
// Normal calculation
// Go throuch each vertex for the entire geometry and calculate the normal vector based on connected
// vertices. This includes vertex connections between submeshes so we should get smooth transitions across submeshes.
int numSharedNormals = geoCache._sharedNormalIndices.Length;
for (int a = 0; a < numSharedNormals; ++a)
{
for (int b = 0; b < geoCache._sharedNormalIndices[a].Count; ++b)
{
Vector3 sumNormal = new Vector3();
VertexEntry leftEntry = geoCache._sharedNormalIndices[a][b];
HEU_MeshData leftSubMesh = subMeshesMap[leftEntry._meshKey];
List<VertexEntry> rightList = geoCache._sharedNormalIndices[a];
for (int c = 0; c < rightList.Count; ++c)
{
VertexEntry rightEntry = rightList[c];
HEU_MeshData rightSubMesh = subMeshesMap[rightEntry._meshKey];
if (leftEntry._vertexIndex == rightEntry._vertexIndex)
{
sumNormal += rightSubMesh._triangleNormals[rightEntry._normalIndex];
}
else
{
float dot = Vector3.Dot(leftSubMesh._triangleNormals[leftEntry._normalIndex],
rightSubMesh._triangleNormals[rightEntry._normalIndex]);
if (dot >= geoCache._cosineThreshold)
{
sumNormal += rightSubMesh._triangleNormals[rightEntry._normalIndex];
}
}
}
leftSubMesh._normals[leftEntry._vertexIndex] = sumNormal.normalized;
}
}
}
// Go through each valid submesh data and upload into a CombineInstance for combining.
// Each CombineInstance represents a submesh in the final mesh.
// And each submesh in that final mesh corresponds to a material.
// Filter out only the submeshes with valid geometry
List<Material> validMaterials = new List<Material>();
List<int> validSubmeshes = new List<int>();
Dictionary<int, HEU_MaterialData> assetMaterialMap = asset.GetMaterialDataMap();
foreach (KeyValuePair<int, HEU_MeshData> meshPair in subMeshesMap)
{
HEU_MeshData meshData = meshPair.Value;
if (meshData._indices.Count > 0)
{
int materialKey = meshPair.Key;
// Find the material or create it
HEU_MaterialData materialData = null;
HEU_UnityMaterialInfo unityMaterialInfo = null;
if (geoCache._unityMaterialInfos.TryGetValue(materialKey, out unityMaterialInfo))
{
if (!assetMaterialMap.TryGetValue(materialKey, out materialData))
{
// Create the material
materialData = asset.CreateUnitySubstanceMaterialData(materialKey, unityMaterialInfo._unityMaterialPath, unityMaterialInfo._substancePath, unityMaterialInfo._substanceIndex);
assetMaterialMap.Add(materialData._materialKey, materialData);
}
}
else if (!assetMaterialMap.TryGetValue(materialKey, out materialData))
{
if (materialKey == defaultMaterialKey)
{
materialData = asset.GetOrCreateDefaultMaterialInCache(session, geoCache.GeoID, geoCache.PartID, false);
}
else
{
materialData = asset.CreateHoudiniMaterialData(session, materialKey, geoCache.GeoID, geoCache.PartID);
}
}
if (materialData != null)
{
validSubmeshes.Add(meshPair.Key);
validMaterials.Add(materialData._material);
if (materialData != null && bPartInstanced)
{
// Handle GPU instancing on material for instanced meshes
if (materialData._materialSource != HEU_MaterialData.Source.UNITY && materialData._materialSource != HEU_MaterialData.Source.SUBSTANCE)
{
// Always enable GPU instancing for material generated from Houdini
HEU_MaterialFactory.EnableGPUInstancing(materialData._material);
}
}
}
}
}
int validNumSubmeshes = validSubmeshes.Count;
CombineInstance[] meshCombiner = new CombineInstance[validNumSubmeshes];
for (int submeshIndex = 0; submeshIndex < validNumSubmeshes; ++submeshIndex)
{
HEU_MeshData submesh = subMeshesMap[validSubmeshes[submeshIndex]];
CombineInstance combine = new CombineInstance();
combine.mesh = new Mesh();
#if UNITY_2017_3_OR_NEWER
combine.mesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
#endif
combine.mesh.SetVertices(submesh._vertices);
combine.mesh.SetIndices(submesh._indices.ToArray(), MeshTopology.Triangles, 0);
if (submesh._colors.Count > 0)
{
combine.mesh.SetColors(submesh._colors);
}
if (submesh._normals.Count > 0)
{
combine.mesh.SetNormals(submesh._normals);
}
if (submesh._tangents.Count > 0)
{
combine.mesh.SetTangents(submesh._tangents);
}
if (bGenerateUVs)
{
// TODO: revisit to test this out
Vector2[] generatedUVs = HEU_GeometryUtility.GeneratePerTriangle(combine.mesh);
if (generatedUVs != null)
{
combine.mesh.uv = generatedUVs;
}
}
else if (submesh._UVs.Count > 0)
{
combine.mesh.SetUVs(0, submesh._UVs);
}
if (submesh._UV2s.Count > 0)
{
combine.mesh.SetUVs(1, submesh._UV2s);
}
if (submesh._UV3s.Count > 0)
{
combine.mesh.SetUVs(2, submesh._UV3s);
}
combine.transform = Matrix4x4.identity;
combine.mesh.RecalculateBounds();
//Debug.LogFormat("Number of submeshes {0}", combine.mesh.subMeshCount);
meshCombiner[submeshIndex] = combine;
}
// Geometry data
MeshFilter meshFilter = HEU_GeneralUtility.GetOrCreateComponent<MeshFilter>(gameObject);
meshFilter.sharedMesh = new Mesh();
#if UNITY_2017_3_OR_NEWER
meshFilter.sharedMesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
#endif
meshFilter.sharedMesh.name = geoCache._partName + "_mesh";
meshFilter.sharedMesh.CombineMeshes(meshCombiner, false, false);
meshFilter.sharedMesh.RecalculateBounds();
if (!geoCache._tangentAttrInfo.exists && bGenerateTangents)
{
HEU_GeometryUtility.CalculateMeshTangents(meshFilter.sharedMesh);
}
meshFilter.sharedMesh.UploadMeshData(true);
// Render data
MeshRenderer meshRenderer = HEU_GeneralUtility.GetOrCreateComponent<MeshRenderer>(gameObject);
meshRenderer.sharedMaterials = validMaterials.ToArray();
bGenerated = true;
}
#if HEU_PROFILER_ON
Debug.LogFormat("GENERATE MESH TIME:: {0}", (Time.realtimeSinceStartup - generateMeshTime));
#endif
return bGenerated;
}