moving an object | GameDev.net

marlow · 2000-12-08T01:40:21+00:00

hi, I have a set of 3d objects on the screen, I want to move them just like you would a sprite, how is this achieved - is it by applying some translation matrix on the vertices for these objects? Any help is much appreciated.

Do you use D3D or OpenGL?
If you use D3D, before you draw you 3D object, you must specify its world matrix. For example:

D3DXMATRIX transMtx;
D3DXMatrixTranslation(&transMtx, 0.0f, 0.0f, 2.0f * lapsed_time);
pD3DDev->SetTransform(D3DTS_WORLD, &transMtx);
DrawObject();

With this code, you create a translation matrix that will move the object 2 world units per second along z axis. After that, you must set the world matrix with your translation matrix and draw the object.

If you use OpenGL you must use:

glTranslatef(0.0f, 0.0f, 2.0f * delta_time);
DrawObject();

I think that you must use glPushMatrix() and glPopMatrix() combination too..

I hope this help.

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