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terrysworkstations

Textures in Directx 11

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Im in DirectX 11 using the D3DX11CreateShaderResourceViewFromFile for textures. I have to rotate texture file 180 and flip horizontal in Mspaint for the texture to fit on the object.  SO when I have a .obj object with text, it will be backwards like in the image. I have to rotate and flip with all objects that have textures.Does anyone know how to fix the issue?

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Edited by terrysworkstations

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from, http://www.rastertek.com/dx11tut08.html,

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Right hand to Left hand conversion

By default Maya 2011 is a right handed coordinate system and exports the .obj file data in right hand coordinates. To convert that data into a left handed system which DirectX 11 is by default you have to do the following:

1. Invert the Z coordinate vertices. In the code you will see it do this: vertices[vertexIndex].z = vertices[vertexIndex].z * -1.0f;

2. Invert the TV texture coordinate. In the code you will see it do this: texcoords[texcoordIndex].y = 1.0f - texcoords[texcoordIndex].y;

3. Invert the NZ normal vertex. In the code you will see it do this: normals[normalIndex].z = normals[normalIndex].z * -1.0f;

4. Convert the drawing order from counter clockwise to clockwise. In the code I simply read in the indexes in reverse order instead of re-organizing it after the fact:

fin >> faces[faceIndex].vIndex3 >> input2 >> faces[faceIndex].tIndex3 >> input2 >> faces[faceIndex].nIndex3; fin >> faces[faceIndex].vIndex2 >> input2 >> faces[faceIndex].tIndex2 >> input2 >> faces[faceIndex].nIndex2; fin >> faces[faceIndex].vIndex1 >> input2 >> faces[faceIndex].tIndex1 >> input2 >> faces[faceIndex].nIndex1;

With those four steps complete the model data will be ready for DirectX 11 to render correctly.

 

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