Solved:right hand coordinate matrix to left hand coordinate?

[vivekSivamRP]

Hi all, i'm using blender for my 3D model which uses right-hand coordinate system, so when i try to import the model to irrlicht engine( left-hand coordinate system) the mesh and animation looks inverted in x axis.

(for ex, in blender my human Model performs animations in right hand but in irrlicht it does it on left hand side.)

so i'm trying convert the matrices from right hand coordinate to left hand. Can any one give some guidelines to proceed ?

[CuteAlien]

Generally importers should handle this. Which format are you using?

[vivekSivamRP]

we have written our own export plugin for animated model in blender .Animation ,appearance and everything works fine but works inverted in x axis.
In the export plugin , we have written the matrix for bones and models in blender format itself(right hand coordinate) , after exporting we import the model in irrlicht engine which works on left hand coordinate matrix.

So what we are trying is to convert Right handed to left handed matrix in export plugin itself.

[CuteAlien]

I had to do that recently and found a solution here: http://stackoverflow.com/questions/1263 ... ate-system

It depends a little bit on your situation, but in my case Gerrit's answer was the one that had worked. In my case I had to swap axes z up to y up as well. So your solution might be on of the other ones mentioned there (which did not work for me...).

In pseudo-code (aka ruby...):

Code: Select all

 
t = [1,  0,  0,  0, 
     0,  0,  1,  0, 
     0,  -1,  0,  0,
     0,  0,  0,  1]
result =  multiplyMatrix4x4( result, t)              
t = [1,  0,  0,  0, 
     0,  0,  1,  0, 
     0,  1,  0,  0,
     0,  0,  0,  1]         
result =  multiplyMatrix4x4( t, result)
 

And don't ask me for an explanation - I was too lazy to work through this myself :-)

[vivekSivamRP]

After following Gerrit's procedure , all the issues were solved. Thanks cuteAlien And this problem taught me how important is, to go through matrix calculations.