static void bend_geometry(ISimplygonSDK sdk, spScene scene)
{
// The two bones that influence the vertices
//spMatrix4x4 sp_bone1;
spGeometryData geom = Utils.SimplygonCast <spSceneMesh>(scene.GetRootNode().GetChild(0)).GetGeometry();
// get the bone weights field and ids
spRealArray boneWeights = geom.GetBoneWeights();
spRidArray boneIds = geom.GetBoneIds();
// get the Coordinates field
spRealArray Coords = geom.GetCoords();
// now, transform all vertices' coordinates using the bones
for (int v = 0; v < Coords.GetTupleCount(); ++v)
{
Vector3D vtx = new Vector3D(Coords.GetItem(v * 3 + 0), Coords.GetItem(v * 3 + 1), Coords.GetItem(v * 3 + 2));
uint no = boneIds.GetItemCount();
int bone_id_1 = boneIds.GetItem(v * 2 + 0);
int bone_id_2 = boneIds.GetItem(v * 2 + 1);
spSceneBone bone_1;
spSceneBone bone_2;
Matrix4x4 b1gtMat;
Matrix4x4 b2gtMat;
Vector3D vtx1 = new Vector3D(vtx);
Vector3D vtx2 = new Vector3D(vtx);
if (bone_id_1 != -1)
{
bone_1 = scene.GetBoneTable().GetBone(bone_id_1);
//retrieve the global transform of the bone in bind space
spMatrix4x4 rootGlobalTransform = sdk.CreateMatrix4x4();
bone_1.EvaluateDefaultGlobalTransformation(rootGlobalTransform);
//apply transfrom to animate bone
spTransform3 bone1_transform = sdk.CreateTransform3();
bone1_transform.AddTransformation(rootGlobalTransform);
bone1_transform.AddRotation(GetRadFromDegrees(-30), 1, 0, 0);
rootGlobalTransform = bone1_transform.GetMatrix();
//apply transform
b1gtMat = GetMatrix4x4FromIMatrix(rootGlobalTransform);
vtx1 = b1gtMat.MultiplyPointVector(vtx);
}
if (bone_id_2 != -1)
{
bone_2 = scene.GetBoneTable().GetBone(bone_id_2);
spMatrix4x4 boneGlobalTransform = sdk.CreateMatrix4x4();
bone_2.EvaluateDefaultGlobalTransformation(boneGlobalTransform);
spTransform3 bone2_transform = sdk.CreateTransform3();
//transform into bone2's local space and apply transform
bone2_transform.PreMultiply();
boneGlobalTransform.Invert();
bone2_transform.AddTransformation(boneGlobalTransform);
bone2_transform.AddRotation(GetRadFromDegrees(-30), 1, 0, 0);
bone2_transform.AddTranslation(0.0f, 17.5f, 0.0f);
//apply transform of the first bone
bone2_transform.AddRotation(GetRadFromDegrees(-30), 1, 0, 0);
//get the global transform matrix for the animation pose
boneGlobalTransform = bone2_transform.GetMatrix();
b2gtMat = GetMatrix4x4FromIMatrix(boneGlobalTransform);
//apply transform to the vertex
vtx2 = b2gtMat.MultiplyPointVector(vtx);
}
//get the bone weights from the geometry data
float blend1 = boneWeights.GetItem(v * 2 + 0);
float blend2 = boneWeights.GetItem(v * 2 + 1);
// normalize the blend
float blend_scale = 1.0f / (blend1 + blend2);
blend1 *= blend_scale;
blend2 *= blend_scale;
// do a linear blend
vtx = vtx1 * blend1 + vtx2 * blend2;
// store in coordinates
Coords.SetItem(v * 3 + 0, vtx.x);
Coords.SetItem(v * 3 + 1, vtx.y);
Coords.SetItem(v * 3 + 2, vtx.z);
}
}