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POXNA - Render Tree rotations and translations
 

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    <p>I have started working with XNA this week, currently building a good core that I will be able to use for future games.</p> <p>I can't complete my render tree because I don't know how to code the following:</p> <p>(I am used to work with OpenGL a lot, so I am looking for the fastest equivalent to this code)</p> <pre><code>public void DrawRecursively( GameTime deltaTime ) { glPushMatrix(); /* these 3 lines are what i didn't figure out with XNA */ glTranslate3f( position[0], position[1], position[2] ); glRotatef( theta, 0.0f, 1.0f, 0.0f ); glRotatef( phi, 1.0f, 0.0f, 0.0f ); this.Draw( deltaTime ); foreach ( ComponentInterface child in childs ) { child.DrawRecursively( deltaTime ); } glPopMatrix(); } </code></pre> <p>My current attempt is something like this:</p> <pre><code>public void DrawRecursively( GameTime deltaTime, Matrix worldMatrix ) { Matrix backup = worldMatrix; // TRANSLATE HERE. // ROTATE HERE. this.Draw( deltaTime ); foreach ( ComponentInterface child in childs ) { child.DrawRecursively( deltaTime, worldMatrix ); } worldMatrix = backup; } </code></pre> <p>I understand that the worldMatrix can't be implicitly accessed from anywhere and that you have to carry a reference to it. How do I translate and rotate then? And is my <code>worldMatrix</code> backup the correct way to do the equivalent of a <code>glPushMatrix</code>/<code>PopMatrix</code> block?</p> <p>Thanks,</p> <p>Nick</p> <hr> <p>EDIT:</p> <p>I think I managed to make a few steps forward, this being said, it is still not working. God I miss openGL and all the detailed documentation, MSDN won't give me much info... Here is my latest approach :</p> <pre><code>public void DrawRecursively( GameTime deltaTime, BasicEffect effect ) { Matrix worldMatrix = effect.World; Matrix backup = worldMatrix; worldMatrix = worldMatrix * Matrix.CreateTranslation( position.ToVector3() ); worldMatrix = worldMatrix * Matrix.CreateRotationY( theta ); worldMatrix = worldMatrix * Matrix.CreateRotationX( phi ); effect.Parameters["xWorld"].SetValue( worldMatrix ); this.Draw( deltaTime ); foreach ( ComponentInterface child in childs ) { child.DrawRecursively( deltaTime, effect ); } effect.Parameters["xWorld"].SetValue( backup ); } </code></pre> <p><code>effect.Parameters["xWorld"]</code> returns me a null pointer so <code>SetValue</code> obviously throws me an access violation error. I have double checked and the effect instance is correctly initialize, according to the debugger. </p> <p>Is this the correct way to do it?</p> <hr> <p>EDIT AGAIN :</p> <p>Thanks to your help, I am a little close to success, but the triangle is still static and wont rotate even when incrementing its orientation angles.</p> <pre><code>public void DrawRecursively( GameTime deltaTime, BasicEffect effect ) { Matrix worldMatrix = effect.World; Matrix backup = worldMatrix; effect.World = worldMatrix * Matrix.CreateScale( scale ) * Matrix.CreateRotationX( orientation.X ) * Matrix.CreateRotationX( orientation.Y ) * Matrix.CreateRotationX( orientation.Z ) * Matrix.CreateTranslation( position.ToVector3() ); this.Draw( deltaTime ); foreach ( ComponentInterface child in childs ) { child.DrawRecursively( deltaTime, effect ); } effect.World = backup; } </code></pre>
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