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noatom

Simple 3D model loader DirectX 11

6 posts in this topic

Does someone have a simple model loader that works with DirectX 11?

I tried working with assimp but I failed,mostly because I'm not such an expert in meshes yet and because all source codes are using directx 9.

So does anyone have a simple 3d model loader that works with dx 11?
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I just made the simplest model loader

Code that creates the file with the mesh

[source lang="java"]#include <stdio.h>
#include <d3dx10math.h>

int main ()
{
FILE * pFile;

D3DXVECTOR3 vertices[] =
{
{ D3DXVECTOR3( 1.0f,1.0f,1.0f )},
{ D3DXVECTOR3( 1.0f,1.0f,1.0f )},
{ D3DXVECTOR3( 1.0f,1.0f,1.0f )},
};

DWORD indices[] =
{
0,1,2,
};

pFile = fopen ( "myfile.bin" , "wb" );
fwrite (vertices , 1 , sizeof(vertices) , pFile );
fwrite (indices , 1 , sizeof(indices) , pFile );

fclose (pFile);

return 0;
}[/source]
Code that loads the file with the mesh

[source lang="java"] FILE * pFile;
pFile = fopen ( "myfile.bin" , "rb" );

D3DXVECTOR3 vertices[3];
fread (vertices,sizeof(vertices),1,pFile);

DWORD indices[3];
fread (indicess,sizeof(indices),1,pFile);

fclose (pFile);[/source] Edited by lomateron
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this is directx 11 not 10.In directx 11 we don't have meshes....if it would be that easy...
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Specifically we don't have the .x format, but "mesh" is a generic description of any triangle model format and there's absolutely nothing to stop you using any other format you like in D3D11. You could probably even hack up a basic .x binary loader for 11 if you were so inclined.
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I suggest you to use the FBX SDK to load a FBX file and convert it into your own custom format, because the FBX file takes too long to load.
If you want I can give you some help with the FBX SDK.
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I'm using Assimp and it's working great! The hardest part is to import animated models and extracting the skinning data from the aiScene object. But just loading static models is really simple, here's how I do it:

[source lang="cpp"]//! Loads and returns a static model from a file.
StaticModel* ModelImporter::LoadStaticModel(string filename)
{
// Is the model already loaded?
if(mStaticModelMap.find(filename) != mStaticModelMap.end())
return mStaticModelMap[filename];

Assimp::Importer importer;
mFilename = filename;
StaticModel* model = NULL;

// Important! Makes sure that if the angle between two face normals is > 80 they are not smoothed together.
// Since the angle between a cubes face normals is 90 the lighting looks very bad if we don't specify this.
importer.SetPropertyFloat(AI_CONFIG_PP_GSN_MAX_SMOOTHING_ANGLE, 80.0f);
importer.SetPropertyInteger(AI_CONFIG_IMPORT_TER_MAKE_UVS, 1);
importer.SetPropertyInteger(AI_CONFIG_PP_SBP_REMOVE, aiPrimitiveType_LINE);

// Load scene from the file.
const aiScene* scene = importer.ReadFile(filename,
aiProcess_CalcTangentSpace |
aiProcess_Triangulate |
aiProcess_GenSmoothNormals |
aiProcess_SplitLargeMeshes |
aiProcess_ConvertToLeftHanded |
aiProcess_SortByPType);

// Successfully loaded the scene.
if(scene)
{
// Create the model that is getting filled out.
model = new StaticModel();

// Loop through all meshes.
for(int i = 0; i < scene->mNumMeshes; i++)
{
aiMesh* assimpMesh = scene->mMeshes[i];
vector<Vertex> vertices;
vector<UINT> indices;

// Add vertices to the vertex list.
for(int i = 0; i < assimpMesh->mNumVertices; i++)
{
aiVector3D v = assimpMesh->mVertices[i];
aiVector3D n = assimpMesh->mNormals[i];
aiVector3D t = aiVector3D(0, 0, 0);
if(assimpMesh->HasTextureCoords(0))
t = assimpMesh->mTextureCoords[0][i];

n = n.Normalize();
Vertex vertex(v.x, v.y, v.z, n.x, n.y, n.z, 0, 0, 0, t.x, t.y);
vertices.push_back(vertex);
}

// Add indices to the index list.
for(int i = 0; i < assimpMesh->mNumFaces; i++)
for(int j = 0; j < assimpMesh->mFaces[i].mNumIndices; j++)
indices.push_back(assimpMesh->mFaces[i].mIndices[j]);
}
}
...
}[/source]

I recommend going through the source code for AssimpView, everything you need to know is there. Also, [url="http://nolimitsdesigns.com/game-design/open-asset-import-library-animation-loader/"]this[/url] made it a lot easier to get the animations up and running. It basicly takes care of calculating the final transforms at a given time, really convenient. And if you want to then take a look at my github repository for my graphics library, all the code that has to do with Assimp and model loading is located in this file: [url="https://github.com/simplerr/Graphics-Library/blob/master/Common/ModelImporter.cpp"]https://github.com/s...delImporter.cpp[/url]

Good luck!
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what do you mean with directx doesnt has mesh, to create a vertex or index buffer in directx 11 you do this

InitData.pSysMem = indices;
g_pd3dDevice->CreateBuffer( &bd, &InitData, &g_pIndexBuffer )

thats the same in directx 10.
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