/// weightを付与して、matrixを適用する
static void FixNoSkinJoints(SpanLike <SkinJoints> joints, SpanLike <Vector4> weights, int jointIndex,
SpanLike <Vector3> positions, SpanLike <Vector3> normals, Matrix4x4 matrix)
{
for (int i = 0; i < joints.Length; ++i)
{
var j = new SkinJoints
{
Joint0 = (ushort)jointIndex
};
joints[i] = j;
var w = new Vector4
{
X = 1.0f,
};
weights[i] = w;
{
// position
var src = positions[i];
var dst = Vector4.Transform(new Vector4(src, 1), matrix);
positions[i] = new Vector3(dst.X, dst.Y, dst.Z);
}
{
// normal
var src = normals[i];
var dst = Vector4.Transform(new Vector4(src, 0), matrix);
normals[i] = new Vector3(dst.X, dst.Y, dst.Z);
}
}
}
public static void Write(byte[] bytes, int i, SkinJoints value)
{
Write(bytes, i, value.Joint0);
Write(bytes, i + 2, value.Joint1);
Write(bytes, i + 4, value.Joint2);
Write(bytes, i + 6, value.Joint3);
}
public void Apply(VertexBuffer vertexBuffer, Span <Vector3> dstPosition, Span <Vector3> dstNormal)
{
var jointsBuffer = vertexBuffer.Joints;
var joints = (jointsBuffer != null || jointsBuffer.Count == 0)
? jointsBuffer.GetSpan <SkinJoints>()
: new SkinJoints[vertexBuffer.Count].AsSpan() // when MorphTarget only
;
var weightsBuffer = vertexBuffer.Weights;
var weights = (weightsBuffer != null || weightsBuffer.Count == 0)
? weightsBuffer.GetSpan <Vector4>()
: new Vector4[vertexBuffer.Count].AsSpan() // when MorphTarget only
;
var positionBuffer = vertexBuffer.Positions;
var position = positionBuffer.GetSpan <Vector3>();
bool useNormal = false;
if (!dstNormal.IsEmpty)
{
useNormal = vertexBuffer.Normals != null && dstNormal.Length == dstPosition.Length;
}
for (int i = 0; i < position.Length; ++i)
{
var j = joints[i];
var w = weights[i];
var sum = (w.X + w.Y + w.Z + w.W);
float factor;
if (sum > 0)
{
factor = 1.0f / sum;
}
else
{
factor = 1.0f;
j = new SkinJoints(m_indexOfRoot, 0, 0, 0);
w = new Vector4(1, 0, 0, 0);
}
if (j.Joint0 == ushort.MaxValue)
{
w.X = 0;
}
if (j.Joint1 == ushort.MaxValue)
{
w.Y = 0;
}
if (j.Joint2 == ushort.MaxValue)
{
w.Z = 0;
}
if (j.Joint3 == ushort.MaxValue)
{
w.W = 0;
}
{
var src = new Vector4(position[i], 1); // 位置ベクトル
var dst = Vector4.Zero;
if (w.X > 0)
{
dst += Vector4.Transform(src, m_matrices[j.Joint0]) * w.X * factor;
}
if (w.Y > 0)
{
dst += Vector4.Transform(src, m_matrices[j.Joint1]) * w.Y * factor;
}
if (w.Z > 0)
{
dst += Vector4.Transform(src, m_matrices[j.Joint2]) * w.Z * factor;
}
if (w.W > 0)
{
dst += Vector4.Transform(src, m_matrices[j.Joint3]) * w.W * factor;
}
dstPosition[i] = new Vector3(dst.X, dst.Y, dst.Z);
}
if (useNormal)
{
var normalBuffer = vertexBuffer.Normals;
var normal = normalBuffer != null?normalBuffer.GetSpan <Vector3>() : dstNormal;
var src = new Vector4(normal[i], 0); // 方向ベクトル
var dst = Vector4.Zero;
if (w.X > 0)
{
dst += Vector4.Transform(src, m_matrices[j.Joint0]) * w.X * factor;
}
if (w.Y > 0)
{
dst += Vector4.Transform(src, m_matrices[j.Joint1]) * w.Y * factor;
}
if (w.Z > 0)
{
dst += Vector4.Transform(src, m_matrices[j.Joint2]) * w.Z * factor;
}
if (w.W > 0)
{
dst += Vector4.Transform(src, m_matrices[j.Joint3]) * w.W * factor;
}
dstNormal[i] = new Vector3(dst.X, dst.Y, dst.Z);
}
}
}
public void Apply(INativeArrayManager arrayManager, VertexBuffer vertexBuffer, NativeArray <Vector3> dstPosition, NativeArray <Vector3> dstNormal)
{
var jointsBuffer = vertexBuffer.Joints;
var joints = (jointsBuffer != null || jointsBuffer.Count == 0)
? jointsBuffer.GetAsSkinJointsArray()
: arrayManager.CreateNativeArray <SkinJoints>(vertexBuffer.Count) // when MorphTarget only
;
var weightsBuffer = vertexBuffer.Weights;
var weights = (weightsBuffer != null || weightsBuffer.Count == 0)
? weightsBuffer.GetAsVector4Array()
: arrayManager.CreateNativeArray <Vector4>(vertexBuffer.Count) // when MorphTarget only
;
var positionBuffer = vertexBuffer.Positions;
var position = positionBuffer.Bytes.Reinterpret <Vector3>(1);
bool useNormal = false;
if (dstNormal.Length > 0)
{
useNormal = vertexBuffer.Normals != null && dstNormal.Length == dstPosition.Length;
}
for (int i = 0; i < position.Length; ++i)
{
var j = joints[i];
var w = weights[i];
var sum = (w.x + w.y + w.z + w.w);
float factor;
if (sum > 0)
{
factor = 1.0f / sum;
}
else
{
factor = 1.0f;
j = new SkinJoints(m_indexOfRoot, 0, 0, 0);
w = new Vector4(1, 0, 0, 0);
}
if (j.Joint0 == ushort.MaxValue)
{
w.x = 0;
}
if (j.Joint1 == ushort.MaxValue)
{
w.y = 0;
}
if (j.Joint2 == ushort.MaxValue)
{
w.z = 0;
}
if (j.Joint3 == ushort.MaxValue)
{
w.w = 0;
}
{
var src = position[i]; // 位置ベクトル
var dst = Vector3.zero;
if (w.x > 0)
{
dst += m_matrices[j.Joint0].MultiplyPoint(src) * w.x * factor;
}
if (w.y > 0)
{
dst += m_matrices[j.Joint1].MultiplyPoint(src) * w.y * factor;
}
if (w.z > 0)
{
dst += m_matrices[j.Joint2].MultiplyPoint(src) * w.z * factor;
}
if (w.w > 0)
{
dst += m_matrices[j.Joint3].MultiplyPoint(src) * w.w * factor;
}
dstPosition[i] = new Vector3(dst.x, dst.y, dst.z);
}
if (useNormal)
{
var normalBuffer = vertexBuffer.Normals;
var normal = normalBuffer != null?normalBuffer.Bytes.Reinterpret <Vector3>(1) : dstNormal;
var src = normal[i]; // 方向ベクトル
var dst = Vector3.zero;
if (w.x > 0)
{
dst += m_matrices[j.Joint0].MultiplyVector(src) * w.x * factor;
}
if (w.y > 0)
{
dst += m_matrices[j.Joint1].MultiplyVector(src) * w.y * factor;
}
if (w.z > 0)
{
dst += m_matrices[j.Joint2].MultiplyVector(src) * w.z * factor;
}
if (w.w > 0)
{
dst += m_matrices[j.Joint3].MultiplyVector(src) * w.w * factor;
}
dstNormal[i] = new Vector3(dst.x, dst.y, dst.z);
}
}
}