Unit size

Unit size

• Jim Stanley

  Thank you for a good answear. I understand what you meen, but is it possible to model a mesh i n 3ds max or Maya and make it exactly 5x5x5 units I am sure Direct3D is choosing the mesh unit size from somewhere...
  
  
  
  

• Sohail Ch.

  Sure though you won't see any particular unit in those applictions either in general. 5x5x5 is just that - an arbitrary number. Some games have meshes sized in the 5x5x5 some sized in the 0.5x.5x.5 - it really doesn't matter as long as all the objects sizes are correct in relation to each other.

  If you open up your .x file in Maya you can certainly shrink the coordinates down.

  
  
  

• CHWu

  There are no 'units' in D3D. It depends on where the camera is. The only thing that is contant is the realtive size of things so something 10 wide will be 5 times thinner than something 50 wide.

  Remember that doing a scale on every frame is trivial for the 3d card - its already applying all the matrices anyway so its not the overhead you think it is. You will have to turn on normalizenormals in the redner state for lighting to work though.

  But to answer your question you can walk through the vertex buffer of the mesh and mutlipl each point by the scale matrix right after loading which will do what you want.

  
  
  

• technoxicated

  To clearify a little... What I think I wan't to do is to scale down my mesh just after loading it, instead of scaling it on every frame render. How come dirext3d choose my mesh to be 10 units wide when it in reality is 50cm wide 1unit=5cm then. Can I tell it to use 1unit=50cm instead If I wanted it to be 1 unit wide how wide will I have to make it in a 3d modeler program to accomplish that

  
  
• Unit size