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3D Text

Started by betaisao Aug 9, 2006 at 11:40 PM 2 replies 550+ views

Original Post

Aug 9, 2006 at 11:40 PM

How to write a 3D text string in an arbitrary size and direction quickly? I used transform methods like scale, rot, but it slowed down my system seriously. I want to draw 3D co-ordinate with numbers attached to the axis. dev.Material = meshMaterial; tmp = dev.Transform.World; xvalue = 0; yvalue = 0; zvalue = 0; xdiv = 1; ydiv = 1; zdiv = 1; Mesh mx, my, mz; for (int i = 0; i <= div; i++) { mx = Mesh.TextFromFont(dev, localFont, xvalue.ToString(), 0.001f, 0.0f); dev.Transform.World = Matrix.RotationZ((float)Math.PI / 2) * setAxisTransformMatrix(xaxis); mx.DrawSubset(0); xvalue += xdiv; my = Mesh.TextFromFont(dev, localFont, yvalue.ToString(), 0.001f, 0.0f); dev.Transform.World = setAxisTransformMatrix(yaxis); my.DrawSubset(0); yvalue += ydiv; mz = Mesh.TextFromFont(dev, localFont, zvalue.ToString(), 0.001f, 0.0f); dev.Transform.World = setAxisTransformMatrix(zaxis);//Matrix.RotationX((float)(Math.PI / 2)) * mz.DrawSubset(0); zvalue += zdiv; } dev.Transform.World = tmp; Thanks

Evil Steve

Aug 10, 2006 at 3:48 AM

DrawSubset calls DrawIndexedPrimtive internally, and you want to cut those calls to an absolute minimum. 500 per frame will completely destroy your frame rate.
So, you should be using a dynamic vertex buffer and filling it with data once, then rendering all of your text in one call.

How is your text handled? Are all letters completely independant of each other, or are you rendering a string of text, where all letters are in a row?

betaisao

Aug 11, 2006 at 4:07 AM

Unfortunately, they are all independent. Each of them is rendered to different positions. Is dynamic vertex buffer useful in this situation? I'll try it anyway. Thanks.

Evil Steve

Aug 11, 2006 at 4:17 AM

Yes, definitely. Using meshes like this is not a good idea. Meshes are really designed to have only a few onscreen, certainly not 3 per letter like you seem to be doing.

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