/*
* template AnimationKey
* {
* DWORD keyType;
* DWORD nKeys;
* array TimedFloatKeys keys[nKeys];
* }
*
*
* template TimedFloatKeys
* {
* DWORD time;
* FloatKeys tfkeys;
* }
*
* template FloatKeys
* {
* DWORD nValues;
* array float values[nValues];
* }
*/
/// <summary>
/// Imports a key frame list associated with an animation channel
/// </summary>
/// <param name="keyType">The type of animation keys used by the current channel</param>
/// <returns>The list of key frames for the given key type in the current channel</returns>
private AnimationKeyframe[] ImportAnimationKey(out int keyType)
{
// These keys can be rotation (0),scale(1),translation(2), or matrix(3 or 4) keys.
keyType = tokens.SkipName().NextInt();
// Number of frames in channel
int numFrames = tokens.NextInt();
AnimationKeyframe[] frames = new AnimationKeyframe[numFrames];
// Find the ticks per millisecond that defines how fast the animation should go
double ticksPerMS = animTicksPerSecond == null ? DEFAULT_TICKS_PER_SECOND / 1000.0
: (double)animTicksPerSecond / 1000.0;
// fill in the frames
for (int i = 0; i < numFrames; i++)
{
// Create a timespan object that represents the time that the current keyframe
// occurs
TimeSpan time = new TimeSpan(0, 0, 0, 0,
(int)(tokens.NextInt() / ticksPerMS));
// The number of keys that represents the transform for this keyframe.
// Quaternions (rotation keys) have 4,
// Vectors (scale and translation) have 3,
// Matrices have 16
int numKeys = tokens.NextInt();
Matrix transform = new Matrix();
if (numKeys == 16)
{
transform = tokens.NextMatrix();
}
else if (numKeys == 4)
{
Vector4 v = tokens.NextVector4();
Quaternion q = new Quaternion(
new Vector3(-v.Y, -v.Z, -v.W),
v.X);
transform = Matrix.CreateFromQuaternion(q);
}
else if (numKeys == 3)
{
Vector3 v = tokens.NextVector3();
if (keyType == 1)
{
Matrix.CreateScale(ref v, out transform);
}
else
{
Matrix.CreateTranslation(ref v, out transform);
}
}
tokens.SkipToken();
frames[i] = new AnimationKeyframe(time, transform);
}
tokens.SkipToken();
return(frames);
}
// "This template is instantiated on a per-mesh basis. Within a mesh, a sequence of n
// instances of this template will appear, where n is the number of bones (X file frames)
// that influence the vertices in the mesh. Each instance of the template basically defines
// the influence of a particular bone on the mesh. There is a list of vertex indices, and a
// corresponding list of weights.
// template SkinWeights
// {
// STRING transformNodeName;
// DWORD nWeights;
// array DWORD vertexIndices[nWeights];
// array float weights[nWeights];
// Matrix4x4 matrixOffset;
// }
// - The name of the bone whose influence is being defined is transformNodeName,
// and nWeights is the number of vertices affected by this bone.
// - The vertices influenced by this bone are contained in vertexIndices, and the weights for
// each of the vertices influenced by this bone are contained in weights.
// - The matrix matrixOffset transforms the mesh vertices to the space of the bone. When concatenated
// to the bone's transform, this provides the world space coordinates of the mesh as affected by the bone."
// (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/
// directx9_c/dx9_graphics_reference_x_file_format_templates.asp)
//
// Reads in a bone that contains skin weights. It then adds one bone weight
// to every vertex that is influenced by ths bone, which contains the name of the bone and the
// weight.
public void ImportSkinWeights()
{
isSkinned = true;
string boneName = tokens.SkipName().NextString();
// an influence is an index to a vertex that is affected by the current bone
int numInfluences = tokens.NextInt();
List <int> influences = new List <int>();
List <float> weights = new List <float>();
for (int i = 0; i < numInfluences; i++)
{
influences.Add(tokens.NextInt());
}
for (int i = 0; i < numInfluences; i++)
{
weights.Add(tokens.NextFloat());
if (weights[i] == 0)
{
influences[i] = -1;
}
}
influences.RemoveAll(delegate(int i) { return(i == -1); });
weights.RemoveAll(delegate(float f) { return(f == 0); });
// Add the matrix that transforms the vertices to the space of the bone.
// we will need this for skinned animation.
Matrix blendOffset = tokens.NextMatrix();
ContentUtil.ReflectMatrix(ref blendOffset);
skinTransformDictionary.Add(boneName, blendOffset);
SkinTransformContent trans = new SkinTransformContent();
trans.BoneName = boneName;
trans.Transform = blendOffset;
skinTransforms.Add(trans);
// end of skin weights
tokens.SkipToken();
// add a new name/weight pair to every vertex influenced by the bone
for (int i = 0; i < influences.Count; i++)
{
skinInfo[influences[i]].Add(new BoneWeight(boneName,
weights[i]));
}
}