static vector<VertexPN> getMeshVertices(Mesh &mesh) {
vector<VertexPN> vertices;
for (int i = 0, n = mesh.getNumFaces(); i < n; i++) {
Mesh::Face face = mesh.getFace(i);
Cvec3 normals[3];
for (int j = 1; j < face.getNumVertices() - 1; j++) {
if (g_smoothShadeOn) {
normals[0] = face.getVertex(0).getNormal();
normals[1] = face.getVertex(j).getNormal();
normals[2] = face.getVertex(j+1).getNormal();
} else {
normals[0] = normals[1] = normals[2] = face.getNormal();
}
vertices.push_back(VertexPN(face.getVertex(0).getPosition(), normals[0]));
vertices.push_back(VertexPN(face.getVertex(j).getPosition(), normals[1]));
vertices.push_back(VertexPN(face.getVertex(j+1).getPosition(), normals[2]));
}
}
return vertices;
}
static void simpleShadeCube(Mesh& mesh) {
Cvec3 normal = Cvec3(0, 1, 0);
for (int i = 0; i < mesh.getNumFaces(); ++i) {
const Mesh::Face f = mesh.getFace(i);
Cvec3 facenorm = f.getNormal();
for (int j = 0; j < f.getNumVertices(); ++j) {
const Mesh::Vertex v = f.getVertex(j);
v.setNormal(facenorm);
}
}
}
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 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 shadeCube(Mesh& mesh) {
Cvec3 normal = Cvec3(0, 0, 0);
for (int i = 0; i < mesh.getNumVertices(); ++i) {
mesh.getVertex(i).setNormal(normal);
}
for (int i = 0; i < mesh.getNumFaces(); ++i) {
const Mesh::Face f = mesh.getFace(i);
Cvec3 facenorm = f.getNormal();
for (int j = 0; j < f.getNumVertices(); ++j) {
const Mesh::Vertex v = f.getVertex(j);
v.setNormal(facenorm + v.getNormal());
}
}
for (int i = 0; i < mesh.getNumVertices(); ++i) {
const Mesh::Vertex v = mesh.getVertex(i);
if (norm2(v.getNormal()) > .001) {
v.setNormal(normalize(v.getNormal()));
}
}
}
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);
}