Loaded scene form COLLADA is inverted in DirectX

Denis · 2013-03-22T16:13:36

Hello, I use COLLADA to load mesh data to my engine and I use my own converter. I know that matrix from COLLADA for each mesh should be transposed for using in DirectX, I also do this, but I faced with the following problem: scene or single object that I load to my engine after conversion to binary file is inverted along Z and Y axis. I multiply one value from each mesh matrix to -1 during transposition and after that position along Y axis is correct, but not along Z axis. I don`t understand how to translate mesh matrices that all of meshes in scene display correctly. For more details please look to attach screen shots from 3ds max and my engine. outputMatrixValues[12] = (float)matrixValues[3] ; outputMatrixValues[13] = (float)matrixValues[7]; outputMatrixValues[14] = (float)matrixValues[11] * (-1); outputMatrixValues[15] = (float)matrixValues[15] ; On screen shot you can see that scene in 3ds mas is in front position, so the position of both cameras (in my engine and 3ds) is correct. I completely confused with this problem. Help me please.

Graphics and GPU Programming Programming

Started by BlackJoker March 17, 2013 10:19 AM

12 comments, last by iskatsu 11 years, 1 month ago

BlackJoker

1,338

Author

March 19, 2013 05:46 AM

Hello,

Could you please explain how to swap z and y axis for mesh in my engine during loading it? With your help I understood how to load sceene with Y_UP, I also solve problem with Z_UP, but a little tricky.


XMFLOAT4X4 cm;
            cm._11 = 1;
            cm._12 = 0;
            cm._13 = 0;
            cm._14 = 0;
            cm._21 = 0;
            cm._22 = 0;
            cm._23 = 1;
            cm._24 = 0;
            cm._31 = 0;
            cm._32 = 1;
            cm._33 = 0;
            cm._34 = 0;
            cm._41 = 0;
            cm._42 = 0;
            cm._43 = 0;
            cm._44 = 1;

            XMMATRIX matr = XMLoadFloat4x4(&cm);
            
            meshInfo->meshPosition = XMMATRIX(n);
            meshInfo->meshPosition = matr * meshInfo->meshPosition* matr;

here i use some matrix (I don`t know what this matrix is exactly), but aftrei multiply it with mesh matrix which I got from COLLADA, in this sequence meshInfo->meshPosition = matr * meshInfo->meshPosition* matr; and then during loading swap y and z coordinates for each vertex and normal, only then scene look correct,

but I want to ask is there any other more simple (just using matrices without swapping y and z vertices) way to load scene correctly?