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);
}
}
//this function generates a fixed tube
static spScene generate_simple_tube(ISimplygonSDK sdk)
{
const int vertex_count = 16;
const int triangle_count = 24;
const int corner_count = triangle_count * 3;
//create a scene object
spScene scene = sdk.CreateScene();
// triangles x 3 indices ( or 3 corners )
int[] corner_ids = { 0, 1, 4,
4, 1, 5,
5, 1, 6,
1, 2, 6,
6, 2, 3,
6, 3, 7,
7, 3, 0,
7, 0, 4,
4, 5, 8,
8, 5, 9,
9, 5, 10,
5, 6, 10,
10, 6, 7,
10, 7, 11,
11, 7, 4,
11, 4, 8,
8, 9, 12,
12, 9, 13,
13, 9, 14,
9, 10, 14,
14, 10, 11,
14, 11, 15,
15, 11, 8,
15, 8, 12 };
// vertices with values for the x, y and z coordinates.
float[] vertex_coordinates = { 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, -1.0f,
-1.0f, 0.0f, -1.0f,
-1.0f, 0.0f, 1.0f,
1.0f, 15.0f, 1.0f,
1.0f, 15.0f, -1.0f,
-1.0f, 15.0f, -1.0f,
-1.0f, 15.0f, 1.0f,
1.0f, 20.0f, 1.0f,
1.0f, 20.0f, -1.0f,
-1.0f, 20.0f, -1.0f,
-1.0f, 20.0f, 1.0f,
1.0f, 35.0f, 1.0f,
1.0f, 35.0f, -1.0f,
-1.0f, 35.0f, -1.0f,
-1.0f, 35.0f, 1.0f };
spGeometryData geom = sdk.CreateGeometryData();
//add bone weights and ids to geometry data (per vertex)
geom.AddBoneWeights(2);
spRealArray coords = geom.GetCoords();
spRidArray vertex_ids = geom.GetVertexIds();
spRealArray BoneWeights = geom.GetBoneWeights();
spRidArray BoneIds = geom.GetBoneIds();
geom.SetVertexCount(vertex_count);
geom.SetTriangleCount(triangle_count);
//create the bone table
spSceneBoneTable scn_bone_table = scene.GetBoneTable();
//create an array to store bone ids
spRidArray bone_ids = sdk.CreateRidArray();
//create root bone for the scene
spSceneBone root_bone = sdk.CreateSceneBone();
root_bone.SetName("root_bone");
//add the bone to the scene bone table and get a bone id
int root_bone_id = scn_bone_table.AddBone(root_bone);
//a
bone_ids.AddItem(root_bone_id);
spSceneBone parent_bone = root_bone;
//create bones and populate the scene bone table
for (uint bone_index = 1; bone_index < total_bone; bone_index++)
{
spSceneBone bone = sdk.CreateSceneBone();
bone.SetName("ChildBone");
spTransform3 boneTransform = sdk.CreateTransform3();
//SET UP BONE IN BIND POSE
//translate the child bone to its corrent position relative to the parent bone
boneTransform.AddTransformation(bone.GetRelativeTransform());
boneTransform.PreMultiply();
boneTransform.AddTranslation(0.0f, 17.5f, 0.0f);
//store the relatvice transform
bone.GetRelativeTransform().DeepCopy(boneTransform.GetMatrix());
//add bone to the scene bone table
int bone_id = scn_bone_table.AddBone(bone);
//link bone to parent bone
parent_bone.AddChild(bone);
bone_ids.AddItem(bone_id);
parent_bone = bone;
}
float[] v = new float[3];
for (int i = 0; i < vertex_count; ++i)
{
v[0] = vertex_coordinates[i * 3];
v[1] = vertex_coordinates[i * 3 + 1];
v[2] = vertex_coordinates[i * 3 + 2];
coords.SetTuple(i, v);
//real blend_val = real((rid(i)/rid(4)))/real(3);
float blend_val = 0.5f;
float blend1 = 1.0f - blend_val;
float blend2 = blend_val;
int bone_id_1 = 0;
int bone_id_2 = 1;
if (i < 4)
{
bone_id_2 = -1;
blend2 = 0;
blend1 = 1;
}
else if (i > 11)
{
bone_id_1 = -1;
blend2 = 1;
blend1 = 0;
}
blend1 *= blend1;
blend2 *= blend2;
//set the bone weights to perform skining
BoneWeights.SetItem((i * 2) + 0, blend1);
BoneWeights.SetItem((i * 2) + 1, blend2);
//set the bone ids influencing the vertex.
BoneIds.SetItem((i * 2) + 0, bone_id_1);
BoneIds.SetItem((i * 2) + 1, bone_id_2);
}
for (int i = 0; i < corner_count; ++i)
{
vertex_ids.SetItem(i, corner_ids[i]);
}
//create a scene mesh
spSceneMesh mesh = sdk.CreateSceneMesh();
mesh.SetGeometry(geom);
mesh.SetName("mesh");
//get the root node of the scene and add the root_bone and mesh to the scene
scene.GetRootNode().AddChild(mesh);
scene.GetRootNode().AddChild(root_bone);
return(scene);
}