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Rename varialble for better understanding.

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Write some API usage in README.md.
This commit is contained in:
Syoyo Fujita
2016-05-01 21:30:50 +09:00
parent 9d6b58b90e
commit 8d60b4963a
4 changed files with 45 additions and 15 deletions
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36
README.md
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@@ -79,9 +79,9 @@ Features
TODO
----
* [ ] Read .obj/.mtl from memory.
* [ ] Fix Python binding.
* [ ] Unit test codes.
* [ ] Fix obj_sticker example.
* [ ] More unit test codes.
License
-------
@@ -91,6 +91,10 @@ Licensed under MIT license.
Usage
-----
`attrib_t` contains single and linear array of vertex data(position, normal and texcoord).
Each `shape_t` does not contain vertex data but contains array index to `attrib_t`.
See `loader_example.cc` for more details.
```c++
#define TINYOBJLOADER_IMPLEMENTATION // define this in only *one* .cc
#include "tiny_obj_loader.h"
@@ -111,7 +115,33 @@ if (!ret) {
exit(1);
}
// See loader_example.cc for more details.
// Loop over shapes
for (size_t s = 0; s < shapes.size(); s++) {
// Loop over faces(polygon)
size_t index_offset = 0;
for (size_t f = 0; f < shapes[i].mesh.num_face_vertices; f++) {
int fv = shapes[i].mesh.num_face_vertices[f];
// Loop over vertices in the face.
for (size_t v = 0; v < fv; f++) {
// access to vertex
tinyobj::index_t idx = shapes[i].mesh.indices[index_offset + v];
float vx = attrib.positions[3*idx.vertex_index+0];
float vy = attrib.positions[3*idx.vertex_index+1];
float vz = attrib.positions[3*idx.vertex_index+2];
float nx = attrib.normals[3*idx.normal_index+0];
float ny = attrib.normals[3*idx.normal_index+1];
float nz = attrib.normals[3*idx.normal_index+2];
float tx = attrib.texcoords[2*idx.texcoord_index+0];
float ty = attrib.texcoords[2*idx.texcoord_index+1];
}
index_offset += fv;
// per-face material
shapes[i].mesh.material_ids[f];
}
}
```

10
loader_example.cc
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@@ -65,7 +65,7 @@ static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj
}
printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
assert(shapes[i].mesh.material_ids.size() == shapes[i].mesh.num_vertices.size());
assert(shapes[i].mesh.material_ids.size() == shapes[i].mesh.num_face_vertices.size());
for (size_t m = 0; m < shapes[i].mesh.material_ids.size(); m++) {
printf(" material_id[%ld] = %d\n", m,
shapes[i].mesh.material_ids[m]);
@@ -73,10 +73,10 @@ static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj
}
printf("shape[%ld].num_faces: %ld\n", i, shapes[i].mesh.num_vertices.size());
for (size_t v = 0; v < shapes[i].mesh.num_vertices.size(); v++) {
printf(" num_vertices[%ld] = %ld\n", v,
static_cast<long>(shapes[i].mesh.num_vertices[v]));
printf("shape[%ld].num_faces: %ld\n", i, shapes[i].mesh.num_face_vertices.size());
for (size_t v = 0; v < shapes[i].mesh.num_face_vertices.size(); v++) {
printf(" num_face_vertices[%ld] = %ld\n", v,
static_cast<long>(shapes[i].mesh.num_face_vertices[v]));
}
//printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());

8
tests/tester.cc
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@@ -65,7 +65,7 @@ static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj
}
printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
assert(shapes[i].mesh.material_ids.size() == shapes[i].mesh.num_vertices.size());
assert(shapes[i].mesh.material_ids.size() == shapes[i].mesh.num_face_vertices.size());
for (size_t m = 0; m < shapes[i].mesh.material_ids.size(); m++) {
printf(" material_id[%ld] = %d\n", m,
shapes[i].mesh.material_ids[m]);
@@ -73,10 +73,10 @@ static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj
}
printf("shape[%ld].num_faces: %ld\n", i, shapes[i].mesh.num_vertices.size());
for (size_t v = 0; v < shapes[i].mesh.num_vertices.size(); v++) {
printf("shape[%ld].num_faces: %ld\n", i, shapes[i].mesh.num_face_vertices.size());
for (size_t v = 0; v < shapes[i].mesh.num_face_vertices.size(); v++) {
printf(" num_vertices[%ld] = %ld\n", v,
static_cast<long>(shapes[i].mesh.num_vertices[v]));
static_cast<long>(shapes[i].mesh.num_face_vertices[v]));
}
//printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());

6
tiny_obj_loader.h
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@@ -113,7 +113,7 @@ typedef struct {
typedef struct {
std::vector<index_t> indices;
std::vector<unsigned char>
num_vertices; // The number of vertices per face. Up to 255.
num_face_vertices; // The number of vertices per face. 3 = polygon, 4 = quad, ... Up to 255.
std::vector<int> material_ids; // per-face material ID
std::vector<tag_t> tags; // SubD tag
} mesh_t;
@@ -604,7 +604,7 @@ static bool exportFaceGroupToShape(
shape->mesh.indices.push_back(idx1);
shape->mesh.indices.push_back(idx2);
shape->mesh.num_vertices.push_back(3);
shape->mesh.num_face_vertices.push_back(3);
shape->mesh.material_ids.push_back(material_id);
}
} else {
@@ -615,7 +615,7 @@ static bool exportFaceGroupToShape(
idx.texcoord_index = face[k].vt_idx;
}
shape->mesh.num_vertices.push_back(static_cast<unsigned char>(npolys));
shape->mesh.num_face_vertices.push_back(static_cast<unsigned char>(npolys));
shape->mesh.material_ids.push_back(material_id); // per face
}
}