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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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8
README.md
View File

@@ -79,12 +79,13 @@ Features
TODO
----
* [ ] Read .obj/.mtl from memory
* [ ] Read .obj/.mtl from memory.
* [ ] Fix Python binding.
License
-------
Licensed under 2 clause BSD.
Licensed under MIT license.
Usage
-----
@@ -94,11 +95,12 @@ Usage
#include "tiny_obj_loader.h"
std::string inputfile = "cornell_box.obj";
tinyobj::attrib_t attrib;
std::vector<tinyobj::shape_t> shapes;
std::vector<tinyobj::material_t> materials;
std::string err;
bool ret = tinyobj::LoadObj(shapes, materials, err, inputfile.c_str());
bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, inputfile.c_str());
if (!err.empty()) { // `err` may contain warning message.
std::cerr << err << std::endl;

12
examples/viewer/Makefile
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@@ -1,12 +1,16 @@
GLFW_INC=-I/usr/local/include
# OSX
#GLFW_LIBS=-L/usr/local/lib -lglfw3 -lGLEW
#GL_LIBS=-framework OpenGL
UNAME=$(shell uname -s)
# Linux
ifeq ($(UNAME),Darwin)
# OSX
GLFW_LIBS=-L/usr/local/lib -lglfw3 -lGLEW
GL_LIBS=-framework OpenGL
else
# Assume Linux
GLFW_LIBS=-L/usr/local/lib -lglfw3 -lGLEW
GL_LIBS=-lGL -lGLU -lX11 -lXrandr -lXi -lXxf86vm -lXcursor -lXinerama -ldl -pthread
endif
CXX_FLAGS=-Wno-deprecated-declarations

40
examples/viewer/viewer.cc
View File

@@ -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;
@@ -92,6 +92,9 @@ 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());
@@ -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");

3
loader_example.cc
View File

@@ -1,3 +1,6 @@
//
// g++ loader_example.cc
//
#define TINYOBJLOADER_IMPLEMENTATION
#include "tiny_obj_loader.h"

46
tiny_obj_loader.h
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@@ -1,11 +1,30 @@
//
// Copyright 2012-2016, Syoyo Fujita.
//
// Licensed under 2-clause BSD license.
//
/*
The MIT License (MIT)
Copyright (c) 2012-2016 Syoyo Fujita and many contributors.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
//
// version devel : Change data structure. Support different index for
// version 1.0.0 : Change data structure. Change license from BSD to MIT.
// Support different index for
// vertex/normal/texcoord(#73, #39)
// version 0.9.20: Fixes creating per-face material using `usemtl`(#68)
// version 0.9.17: Support n-polygon and crease tag(OpenSubdiv extension)
@@ -117,8 +136,9 @@ typedef struct callback_t_ {
void (*texcoord_cb)(void *user_data, float x, float y);
// -2147483648 will be passed for undefined index
void (*index_cb)(void *user_data, int v_idx, int vn_idx, int vt_idx);
// `name` material name, `materialId` = the array index of material_t[]. -1 if a material not found in .mtl
void (*usemtl_cb)(void *user_data, const char* name, int materialId);
// `name` material name, `materialId` = the array index of material_t[]. -1 if
// a material not found in .mtl
void (*usemtl_cb)(void *user_data, const char *name, int materialId);
// `materials` = parsed material data.
void (*mtllib_cb)(void *user_data, const material_t *materials,
int num_materials);
@@ -126,16 +146,15 @@ typedef struct callback_t_ {
void (*group_cb)(void *user_data, const char **names, int num_names);
void (*object_cb)(void *user_data, const char *name);
callback_t_() :
vertex_cb(NULL),
callback_t_()
: vertex_cb(NULL),
normal_cb(NULL),
texcoord_cb(NULL),
index_cb(NULL),
usemtl_cb(NULL),
mtllib_cb(NULL),
group_cb(NULL),
object_cb(NULL) {
}
object_cb(NULL) {}
} callback_t;
@@ -491,7 +510,8 @@ static vertex_index parseTriple(const char **token, int vsize, int vnsize,
// Parse raw triples: i, i/j/k, i//k, i/j
static vertex_index parseRawTriple(const char **token) {
vertex_index vi(static_cast<int>(0x80000000)); // 0x80000000 = -2147483648 = invalid
vertex_index vi(
static_cast<int>(0x80000000)); // 0x80000000 = -2147483648 = invalid
vi.v_idx = atoi((*token));
(*token) += strcspn((*token), "/ \t\r");