// Specifying shell geometries based on g_tipPos, g_furHeight, and g_numShells.
// You need to call this function whenver the shell needs to be updated
static void updateShellGeometry() {
// TASK 1 and 3 TODO: finish this function as part of Task 1 and Task 3
int numVertices = g_bunnyMesh.getNumVertices();
g_bunnyMeshCopy = Mesh(g_bunnyMesh);
createSmoothNormals(g_bunnyMeshCopy);
RigTForm path = getPathAccumRbt(g_world, g_bunnyNode);
for(int i = 0; i < g_numShells; i++) {
// iterate through each vertex in the mesh
for(int j = 0; j < numVertices; j++) {
Cvec3 normal = g_bunnyMesh.getVertex(j).getNormal();
Cvec3 n = normal * (((double) g_furHeight) / g_numShells);
Cvec3 s = (path * RigTForm(g_tipAtRest[j])).getTranslation();
Cvec3 d = (g_tipPos[j] - s) * (2.0 / (g_numShells * (g_numShells - 1)));
Mesh::Vertex v = g_bunnyMeshCopy.getVertex(j);
Cvec3 vPos = v.getPosition();
Cvec3 newPos = vPos + (n + (d * (i+1)));
v.setPosition(newPos);
v.setNormal(newPos - vPos);
}
uploadMeshToSimpleGeometryPNX(g_bunnyMeshCopy, *(g_bunnyShellGeometries[i]), g_hairyness);
}
}
static void initCubeMesh() {
if (!meshLoaded) {
cubeMesh.load("./cube.mesh");
meshLoaded = true;
}
// set normals
shadeCube(cubeMesh);
// collect vertices from each face and map quads to triangles
vector<VertexPN> verts;
for (int i = 0; i < cubeMesh.getNumFaces(); ++i) {
const Mesh::Face f = cubeMesh.getFace(i);
Cvec3 pos;
Cvec3 normal;
if (g_flat)
normal = f.getNormal();
for (int j = 0; j < f.getNumVertices(); ++j) {
const Mesh::Vertex v = f.getVertex(j);
pos = v.getPosition();
if (!g_flat)
normal = v.getNormal();
verts.push_back(VertexPN(pos, normal));
if (j == 2) {
verts.push_back(VertexPN(pos, normal));
}
}
const Mesh::Vertex v = f.getVertex(0);
pos = v.getPosition();
if (!g_flat)
normal = v.getNormal();
verts.push_back(VertexPN(pos, normal));
}
// add vertices to cube geometry
int numVertices = verts.size();
if (!g_cubeGeometryPN) {
g_cubeGeometryPN.reset(new SimpleGeometryPN());
}
g_cubeGeometryPN->upload(&verts[0], numVertices);
}
static void applySubdivs(Mesh &mesh, int subdivLevel) {
for (int i = 0; i < subdivLevel; i++) {
// subdivide faces
for (int j = 0, n = mesh.getNumFaces(); j < n; j++) {
Mesh::Face face = mesh.getFace(j);
int verticesAroundFace = face.getNumVertices();
Cvec3 vertexSum = Cvec3();
for (int k = 0; k < verticesAroundFace; k++) {
vertexSum += face.getVertex(k).getPosition();
}
vertexSum = vertexSum * (1.0 / verticesAroundFace);
mesh.setNewFaceVertex(face, vertexSum);
}
// subdivide edges
for (int j = 0, n = mesh.getNumEdges(); j < n; j++) {
Mesh::Edge edge = mesh.getEdge(j);
Cvec3 vertexSum = (edge.getVertex(0).getPosition() +
edge.getVertex(1).getPosition() +
mesh.getNewFaceVertex(edge.getFace(0)) +
mesh.getNewFaceVertex(edge.getFace(1))) * 0.25;
mesh.setNewEdgeVertex(edge, vertexSum);
}
// subdivide vertices
for (int j = 0, n = mesh.getNumVertices(); j < n; j++) {
Mesh::Vertex v = mesh.getVertex(j);
int numOfVertices = 0;
Mesh::VertexIterator vertexIter(v.getIterator()), iterOrigin(vertexIter);
Cvec3 accumVertices = Cvec3();
Cvec3 accumFaceVertices = Cvec3();
do {
accumVertices += vertexIter.getVertex().getPosition();
accumFaceVertices += mesh.getNewFaceVertex(vertexIter.getFace());
numOfVertices++;
} while (++vertexIter != iterOrigin);
double factor = 1.0 / (numOfVertices * numOfVertices);
Cvec3 vertexVertex =
v.getPosition() * ((numOfVertices - 2.0) / numOfVertices) +
accumVertices * factor +
accumFaceVertices * factor;
mesh.setNewVertexVertex(mesh.getVertex(j), vertexVertex);
}
// subdivide for each level of subdivision we need
mesh.subdivide();
}
}
void collectVertexVertices(Mesh& m) {
vector<vector<Cvec3> > vertexVertices;
for (int i = 0; i < m.getNumVertices(); ++i) {
const Mesh::Vertex v = m.getVertex(i);
Mesh::VertexIterator it(v.getIterator()), it0(it);
vector<Cvec3> vertices;
vector<Cvec3> faces;
do {
vertices.push_back(it.getVertex().getPosition());
faces.push_back(m.getNewFaceVertex(it.getFace()));
}
while (++it != it0); // go around once the 1ring
Cvec3 vertex = getVertexVertex(v.getPosition(), vertices, faces);
m.setNewVertexVertex(v, vertex);
}
}
// New function that initialize the dynamics simulation
static void initSimulation() {
g_tipPos.resize(g_bunnyMesh.getNumVertices(), Cvec3(0));
g_tipVelocity = g_tipPos;
g_tipAtRest = g_tipPos;
// TASK 1 TODO: initialize g_tipPos to "at-rest" hair tips in world coordinates
int numVertices = g_bunnyMesh.getNumVertices();
for(int i = 0; i < numVertices; i++) {
Mesh::Vertex v = g_bunnyMesh.getVertex(i);
g_tipAtRest[i] = v.getPosition() + (v.getNormal() * g_furHeight);
g_tipPos[i] = (getPathAccumRbt(g_world, g_bunnyNode) * RigTForm(g_tipAtRest[i])).getTranslation();
}
// Starts hair tip simulation
hairsSimulationCallback(0);
}
static void updateShellGeometry() {
float xs[] = {0, g_hairyness, 0};
float ys[] = {0, 0, g_hairyness};
vector<Cvec3> prevPos;
prevPos.resize(g_bunnyMesh.getNumFaces() * 3);
for (int level = 0; level < g_numShells; ++level) {
int counter = 0;
vector<VertexPNX> verts;
for (int i = 0; i < g_bunnyMesh.getNumFaces(); ++i) {
const Mesh::Face f = g_bunnyMesh.getFace(i);
for (int j = 0; j < f.getNumVertices(); ++j) {
const Mesh::Vertex v = f.getVertex(j);
int index = v.getIndex();
Cvec3 pos = v.getPosition();
Cvec3 normal = v.getNormal();
Cvec2 c = Cvec2(xs[j], ys[j]);
Cvec3 n = normal * g_furHeight / g_numShells;
Cvec3 s = pos + (n * g_numShells);
Cvec3 t = world2bunny(g_tipPos[index]);
Cvec3 d = (t - s) / ((g_numShells + 1) * g_numShells / 2);
/* Cvec3 d = (world2bunny(g_tipPos[index]) - (normal * g_furHeight)) / (g_numShells - 1); */
if (level == 0) {
prevPos[counter] = pos;
verts.push_back(VertexPNX(pos, n, c));
}
else {
Cvec3 new_position = prevPos[counter] + n + (d * level);
verts.push_back(VertexPNX(new_position, new_position - prevPos[counter], c));
prevPos[counter] = new_position;
}
++counter;
}
}
int numVertices = verts.size();
g_bunnyShellGeometries[level]->upload(&verts[0], numVertices);
verts.clear();
}
}
//animation timer for mesh
static void animateMeshCallback(int whocares) {
g_meshObject = Mesh(g_meshObjectCopy);
//update animation data, geometry
for(int i = 0; i < 8; ++i){
float ang = g_meshAnimationAngle[i];
ang += (g_meshAnimationSpeed * g_meshAngleSpeed[i]);
//between 0 and PI
if(ang >= M_PI)
ang = 0;
g_meshAnimationAngle[i] = ang;
//between 0 and 1
float scale = sin(ang);
//between 0.5 and 3
float lowerBound = 0.5, upperBound = 3.0;
scale = lowerBound + (scale * (upperBound - lowerBound));
//update geometry
Mesh::Vertex v = g_meshObject.getVertex(i);
Cvec3 vPos = v.getPosition();
//multiply by scale
v.setPosition(vPos * scale);
}
//subdivide modified g_meshObject
subdivideMesh(g_meshObject, g_meshSubdivisionLvl);
//upload geometry
uploadMeshGeometry();
//redraw!
glutPostRedisplay();
glutTimerFunc(1000/g_animateFramesPerSecond,
animateMeshCallback, 0);
}
// New function that initialize the dynamics simulation
static void initSimulation() {
bunnyTransformSet = true;
bunnyTransform = (getPathAccumRbt(g_world, g_bunnyNode));
g_tipPos.resize(g_bunnyMesh.getNumVertices(), Cvec3(0));
g_tipStartPos.resize(g_bunnyMesh.getNumVertices(), Cvec3(0));
g_tipVelocity = g_tipPos;
// TASK 1 TODO: initialize g_tipPos to "at-rest" hair tips in world coordinates
for (int i = 0; i < g_bunnyMesh.getNumVertices(); ++i) {
const Mesh::Vertex v = g_bunnyMesh.getVertex(i);
Cvec3 pos = v.getPosition();
Cvec3 normal = v.getNormal();
g_tipPos[i] = bunny2world(pos + normal * g_furHeight);
g_tipStartPos[i] = bunny2world(pos + normal * g_furHeight);
}
// Starts hair tip simulation
hairsSimulationCallback(0);
}
static void initBunnyMeshes() {
g_bunnyMesh.load("bunny.mesh");
// TODO: Init the per vertex normal of g_bunnyMesh, using codes from asst7
// ...
shadeCube(g_bunnyMesh);
// cout << "Finished shading bunny" << endl;
// TODO: Initialize g_bunnyGeometry from g_bunnyMesh, similar to
vector<VertexPN> verts;
for (int i = 0; i < g_bunnyMesh.getNumFaces(); ++i) {
const Mesh::Face f = g_bunnyMesh.getFace(i);
Cvec3 pos;
Cvec3 normal;
if (g_flat)
normal = f.getNormal();
for (int j = 0; j < f.getNumVertices(); ++j) {
const Mesh::Vertex v = f.getVertex(j);
pos = v.getPosition();
if (!g_flat)
normal = v.getNormal();
verts.push_back(VertexPN(pos, normal));
}
}
// add vertices to bunny geometry
int numVertices = verts.size();
g_bunnyGeometry.reset(new SimpleGeometryPN());
g_bunnyGeometry->upload(&verts[0], numVertices);
// Now allocate array of SimpleGeometryPNX to for shells, one per layer
g_bunnyShellGeometries.resize(g_numShells);
for (int i = 0; i < g_numShells; ++i) {
g_bunnyShellGeometries[i].reset(new SimpleGeometryPNX());
}
}
static void loadMeshGeometry(Mesh& m, GeometryPX& g) {
vector<GLfloat> pos, tex;
for (int i = 0; i < m.getNumFaces(); ++i) {
const Mesh::Face f = m.getFace(i);
for (int j = 0; j < f.getNumVertices(); ++j) {
const Mesh::Vertex v = f.getVertex(j);
pos.push_back((GLfloat)(v.getPosition()[0]));
pos.push_back((GLfloat)(v.getPosition()[1]));
tex.push_back((GLfloat)v.getTexCoords()[0]);
tex.push_back((GLfloat)v.getTexCoords()[1]);
}
}
const unsigned int size = pos.size() * sizeof(GLfloat);
glBindBuffer(GL_ARRAY_BUFFER, g.posVbo);
glBufferData(GL_ARRAY_BUFFER, size, NULL, GL_DYNAMIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, size, &pos[0]);
checkGlErrors();
glBindBuffer(GL_ARRAY_BUFFER, g.texVbo);
glBufferData(GL_ARRAY_BUFFER, size, NULL, GL_DYNAMIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, size, &tex[0]);
checkGlErrors();
}
static void animateCube(int ms) {
float t = (float) ms / (float) g_msBetweenKeyFrames;
// scale all vertices in cube
for (int i = 0; i < cubeMesh.getNumVertices(); ++i) {
const Mesh::Vertex v = cubeMesh.getVertex(i);
Cvec3 pos = v.getPosition();
double factor = (1 + (float(g_div_level)/10)) * ((-1 * sin((double) (g_horiz_scale * ms) / (1000 * (vertex_speeds[i] + .5))) + 1) / 2 + .5);
pos[0] = vertex_signs[i][0] * (factor / sqrt(3));
pos[1] = vertex_signs[i][1] * (factor / sqrt(3));
pos[2] = vertex_signs[i][2] * (factor / sqrt(3));
v.setPosition(pos);
}
// copy mesh to temporary mesh for rendering
Mesh renderMesh = cubeMesh;
// subdivision
for (int i = 0; i < g_div_level; ++i) {
collectFaceVertices(renderMesh);
collectEdgeVertices(renderMesh);
collectVertexVertices(renderMesh);
renderMesh.subdivide();
}
// set normals
shadeCube(renderMesh);
// collect vertices for each face
vector<VertexPN> verts;
int q = 0;
for (int i = 0; i < renderMesh.getNumFaces(); ++i) {
const Mesh::Face f = renderMesh.getFace(i);
Cvec3 pos;
Cvec3 normal;
for (int j = 0; j < f.getNumVertices(); ++j) {
const Mesh::Vertex v = f.getVertex(j);
pos = v.getPosition();
if (!g_flat)
normal = v.getNormal();
else
normal = f.getNormal();
verts.push_back(VertexPN(pos, normal));
if (j == 2) {
verts.push_back(VertexPN(pos, normal));
}
}
const Mesh::Vertex v = f.getVertex(0);
pos = v.getPosition();
if (!g_flat)
normal = v.getNormal();
else
normal = f.getNormal();
verts.push_back(VertexPN(pos, normal));
}
// dump into geometry
int numVertices = verts.size();
g_cubeGeometryPN->upload(&verts[0], numVertices);
glutPostRedisplay();
glutTimerFunc(1000/g_animateFramesPerSecond,
animateCube,
ms + 1000/g_animateFramesPerSecond);
}