protected override GPUBoneWeight[] BuildWeights()
{
CheckInit();
var vertices = mesh.vertices;
var weights = new GPUBoneWeight[mesh.vertexCount];
for (int i = 0, n = vertices.Length; i < n; i++)
{
var p = vertices[i];
var u = 1f + followingBoneCount - ((p.y - min.y) / unitLength);
if (u > 0f)
{
var lu = Mathf.FloorToInt(u);
var cu = Mathf.CeilToInt(u);
var t = Mathf.Clamp01(u - lu);
weights[i].boneIndex0 = (uint)lu;
weights[i].weight0 = 1f - t;
weights[i].boneIndex1 = (uint)cu;
weights[i].weight1 = t;
}
else
{
weights[i].boneIndex0 = 0;
weights[i].weight0 = 1f;
weights[i].boneIndex1 = 0;
weights[i].weight1 = 0f;
}
}
return(weights);
}
protected override GPUBoneWeight[] BuildWeights()
{
var bounds = mesh.bounds;
Vector3 min = bounds.min, max = bounds.max;
// To avoid bind a head bone to vertices, set followingBoneCount to boneCount - 2.
var followingBoneCount = boneCount - 2;
var unit = (max.y - min.y) / followingBoneCount;
var vertices = mesh.vertices;
var weights = new GPUBoneWeight[mesh.vertexCount];
for (int i = 0, n = vertices.Length; i < n; i++)
{
var p = vertices[i];
// 1f offset avoids binding a head bone.
var u = 1f + followingBoneCount - ((p.y - min.y) / unit);
if (u > 0f)
{
var lu = Mathf.FloorToInt(u);
var cu = Mathf.CeilToInt(u);
var t = Mathf.Clamp01(u - lu);
weights[i].boneIndex0 = (uint)lu;
weights[i].weight0 = 1f - t;
weights[i].boneIndex1 = (uint)cu;
weights[i].weight1 = t;
}
else
{
// tip case (u <= 0f)
weights[i].boneIndex0 = 0;
weights[i].weight0 = 1f;
weights[i].boneIndex1 = 0;
weights[i].weight1 = 0f;
}
}
return(weights);
}
void Start()
{
renderer = GetComponent <Renderer>();
material = renderer.material;
var filter = GetComponent <MeshFilter>();
var mesh = filter.sharedMesh;
var bounds = mesh.bounds;
var center = bounds.center;
Vector3 min = bounds.min, max = bounds.max;
var unit = (max.y - min.y) / (division - 1);
var vertices = mesh.vertices;
var weights = new GPUBoneWeight[mesh.vertexCount];
for (int i = 0, n = vertices.Length; i < n; i++)
{
var p = vertices[i];
var u = (division - 1) - (p.y - min.y) / unit;
if (u > 0f)
{
var lu = Mathf.FloorToInt(u);
var cu = Mathf.CeilToInt(u);
var t = u - lu;
weights[i].boneIndex0 = (uint)lu;
weights[i].weight0 = 1f - t;
weights[i].boneIndex1 = (uint)cu;
weights[i].weight1 = t;
}
else
{
// tip case (u <= 0f)
weights[i].boneIndex0 = 0;
weights[i].weight0 = 1;
weights[i].boneIndex1 = 0;
weights[i].weight1 = 0;
}
}
weightBuffer = new ComputeBuffer(mesh.vertexCount, Marshal.SizeOf(typeof(GPUBoneWeight)));
weightBuffer.SetData(weights);
boneBuffer = new ComputeBuffer(division, Marshal.SizeOf(typeof(GPUBone)));
for (int i = 0; i < division; i++)
{
var bone = new GameObject("Bone" + i);
bones.Add(bone.transform);
if (i == 0)
{
// root bone
bone.transform.SetParent(transform, false);
bone.transform.localPosition = new Vector3(center.x, max.y, center.z);
}
else
{
bone.transform.SetParent(bones[i - 1].transform, false);
bone.transform.localPosition = new Vector3(0, -unit, 0);
}
// keep local and global initial transform
locals.Add(new TRS(bone.transform.localPosition, bone.transform.localRotation, bone.transform.localScale));
globals.Add(new TRS(bone.transform));
}
material.SetBuffer(kWeightsKey, weightBuffer);
material.SetBuffer(kBonesKey, boneBuffer);
material.SetInt(kBonesCountKey, division);
material.SetFloat(kBonesCountInvKey, 1f / division);
// bind initial matrix for bones
material.SetMatrix(kBindMatrixKey, transform.localToWorldMatrix);
material.SetMatrix(kBindMatrixInvKey, transform.worldToLocalMatrix);
}
