private void InitSkinInfo(AiMesh mesh, AssimpSceneContainer container)
{
var boneIDs = new uvec4[mesh.Vertexes.Length];
var boneWeights = new vec4[mesh.Vertexes.Length];
AllBoneInfos allBones = container.GetAllBoneInfos();
Dictionary <string, uint> nameIndexDict = allBones.nameIndexDict;
for (int i = 0; i < mesh.BoneCount; i++)
{
AiBone bone = mesh.Bones[i]; // bones that influence this mesh.
uint boneIndex = nameIndexDict[bone.Name];
for (int j = 0; j < bone.VertexWeightCount; j++)
{
AiVertexWeight vertexWeight = bone.VertexWeights[j];
uint vertexID = vertexWeight.VertexID;
for (int t = 0; t < 4; t++)
{
if (boneWeights[vertexID][t] == 0.0f) // fill in x y z w.
{
boneIDs[vertexID][t] = boneIndex;
boneWeights[vertexID][t] = vertexWeight.Weight;
break;
}
}
}
}
this.boneIDs = boneIDs;
this.boneWeights = boneWeights;
}
public AllBoneInfos GetAllBoneInfos()
{
if (this.allBoneInfos == null)
{
this.allBoneInfos = InitBonesInfo(aiScene);
}
return(this.allBoneInfos);
}
private static void ReadNodeHeirarchy(float animationTime, AiNode node, AiAnimation animation, mat4 parentTransform, AllBoneInfos allBoneInfos)
{
string nodeName = node.Name;
mat4 nodeTransform = node.Transform.ToMat4();
AiNodeAnimationChannel nodeAnim = FineNodeAnim(animation, nodeName);
if (nodeAnim != null)
{
mat4 mat = mat4.identity();
// Interpolate scaling and generate scaling transformation matrix
vec3 scaling = CalcInterpolatedScaling(animationTime, nodeAnim);
mat4 scalingMat = glm.scale(mat, new vec3(scaling.X, scaling.Y, scaling.Z));
// Interpolate rotation and generate rotation transformation matrix
Quaternion rotation = CalcInterpolatedRotation(animationTime, nodeAnim);
mat4 rotationMat = new AiMatrix4x4(rotation.GetMatrix()).ToMat4();
// Interpolate translation and generate translation transformation matrix
vec3 translation = CalcInterpolatedPosition(animationTime, nodeAnim);
mat4 translationMat = glm.translate(mat4.identity(), new vec3(translation.X, translation.Y, translation.Z));
// Combine the above transformations
nodeTransform = translationMat * rotationMat * scalingMat;
}
mat4 globalTransformation = parentTransform * nodeTransform;
if (allBoneInfos.nameIndexDict.ContainsKey(nodeName))
{
uint BoneIndex = allBoneInfos.nameIndexDict[nodeName];
allBoneInfos.boneInfos[BoneIndex].finalTransformation = globalTransformation * allBoneInfos.boneInfos[BoneIndex].bone.OffsetMatrix.ToMat4();
}
for (int i = 0; i < node.ChildCount; i++)
{
ReadNodeHeirarchy(animationTime, node.Children[i], animation, globalTransformation, allBoneInfos);
}
}
/// <summary>
///
/// </summary>
/// <param name="aiScene"></param>
/// <param name="TimeInSeconds"></param>
/// <returns></returns>
public static mat4[] GetBoneMatrixes(this AiScene aiScene, float TimeInSeconds, AllBoneInfos allBones)
{
if (!aiScene.HasAnimations)
{
return(null);
}
double ticksPerSecond = aiScene.Animations[0].TicksPerSecond;
if (ticksPerSecond == 0)
{
ticksPerSecond = 25.0;
}
double timeInTicks = TimeInSeconds * ticksPerSecond;
float animationTime = (float)(timeInTicks % aiScene.Animations[0].DurationInTicks);
AiMatrix4x4 transform = aiScene.RootNode.Transform;
transform.Inverse();
ReadNodeHeirarchy(animationTime, aiScene.RootNode, aiScene.Animations[0], transform.ToMat4(), allBones);
int boneCount = allBones.boneInfos.Length;
var result = new mat4[boneCount];
for (int i = 0; i < boneCount; i++)
{
result[i] = allBones.boneInfos[i].finalTransformation;
}
return(result);
}
