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Show normal vector in viewer example.

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This commit is contained in:
Syoyo Fujita
2016-04-20 16:00:45 +09:00
parent 7399aedfdd
commit 58fa260605
5 changed files with 88 additions and 39 deletions
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42
examples/viewer/viewer.cc
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@@ -30,8 +30,8 @@ typedef struct {
std::vector<DrawObject> gDrawObjects;
int width = 512;
int height = 512;
int width = 768;
int height = 768;
double prevMouseX, prevMouseY;
bool mouseLeftPressed;
@@ -92,8 +92,11 @@ bool LoadObjAndConvert(float bmin[3], float bmax[3], std::vector<DrawObject>& dr
return false;
}
printf("# of vertices = %d\n", (int)(attrib.vertices.size()) / 3);
printf("# of normals = %d\n", (int)(attrib.normals.size()) / 3);
printf("# of texcoords = %d\n", (int)(attrib.texcoords.size()) / 2);
printf("# of materials = %d\n", (int)materials.size());
printf("# of shapes = %d\n", (int)shapes.size());
printf("# of shapes = %d\n", (int)shapes.size());
bmin[0] = bmin[1] = bmin[2] = std::numeric_limits<float>::max();
bmax[0] = bmax[1] = bmax[2] = -std::numeric_limits<float>::max();
@@ -101,7 +104,7 @@ bool LoadObjAndConvert(float bmin[3], float bmax[3], std::vector<DrawObject>& dr
{
for (size_t s = 0; s < shapes.size(); s++) {
DrawObject o;
std::vector<float> vb; // pos(3float), normal(3float)
std::vector<float> vb; // pos(3float), normal(3float), color(3float)
for (size_t f = 0; f < shapes[s].mesh.indices.size()/3; f++) {
tinyobj::index_t idx0 = shapes[s].mesh.indices[3*f+0];
@@ -150,6 +153,19 @@ bool LoadObjAndConvert(float bmin[3], float bmax[3], std::vector<DrawObject>& dr
vb.push_back(n[k][0]);
vb.push_back(n[k][1]);
vb.push_back(n[k][2]);
// Use normal as color.
float c[3] = {n[k][0], n[k][1], n[k][2]};
float len2 = c[0] * c[0] + c[1] * c[1] + c[2] * c[2];
if (len2 > 0.0f) {
float len = sqrtf(len2);
c[0] /= len;
c[1] /= len;
c[2] /= len;
}
vb.push_back(c[0] * 0.5 + 0.5);
vb.push_back(c[1] * 0.5 + 0.5);
vb.push_back(c[2] * 0.5 + 0.5);
}
}
@@ -160,7 +176,8 @@ bool LoadObjAndConvert(float bmin[3], float bmax[3], std::vector<DrawObject>& dr
glGenBuffers(1, &o.vb);
glBindBuffer(GL_ARRAY_BUFFER, o.vb);
glBufferData(GL_ARRAY_BUFFER, vb.size() * sizeof(float), &vb.at(0), GL_STATIC_DRAW);
o.numTriangles = vb.size() / 6 / 3;
o.numTriangles = vb.size() / 9 / 3;
printf("shape[%d] # of triangles = %d\n", static_cast<int>(s), o.numTriangles);
}
gDrawObjects.push_back(o);
@@ -243,8 +260,8 @@ void motionFunc(GLFWwindow* window, double mouse_x, double mouse_y){
add_quats(prev_quat, curr_quat, curr_quat);
} else if (mouseMiddlePressed) {
eye[0] += transScale * (mouse_x - prevMouseX) / (float)width;
lookat[0] += transScale * (mouse_x - prevMouseX) / (float)width;
eye[0] -= transScale * (mouse_x - prevMouseX) / (float)width;
lookat[0] -= transScale * (mouse_x - prevMouseX) / (float)width;
eye[1] += transScale * (mouse_y - prevMouseY) / (float)height;
lookat[1] += transScale * (mouse_y - prevMouseY) / (float)height;
} else if (mouseRightPressed) {
@@ -274,8 +291,10 @@ void Draw(const std::vector<DrawObject>& drawObjects)
glBindBuffer(GL_ARRAY_BUFFER, o.vb);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glVertexPointer(3, GL_FLOAT, 24, (const void*)0);
glNormalPointer(GL_FLOAT, 24, (const void*)(sizeof(float)*3));
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(3, GL_FLOAT, 36, (const void*)0);
glNormalPointer(GL_FLOAT, 36, (const void*)(sizeof(float)*3));
glColorPointer(3, GL_FLOAT, 36, (const void*)(sizeof(float)*6));
glDrawArrays(GL_TRIANGLES, 0, 3 * o.numTriangles);
CheckErrors("drawarrays");
@@ -296,8 +315,9 @@ void Draw(const std::vector<DrawObject>& drawObjects)
glBindBuffer(GL_ARRAY_BUFFER, o.vb);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glVertexPointer(3, GL_FLOAT, 24, (const void*)0);
glNormalPointer(GL_FLOAT, 24, (const void*)(sizeof(float)*3));
glDisableClientState(GL_COLOR_ARRAY);
glVertexPointer(3, GL_FLOAT, 36, (const void*)0);
glNormalPointer(GL_FLOAT, 36, (const void*)(sizeof(float)*3));
glDrawArrays(GL_TRIANGLES, 0, 3 * o.numTriangles);
CheckErrors("drawarrays");