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DarkBASIC Professional Discussion / Transformation Matrix in an Object

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Bulleyes
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Posted: 31st May 2003 19:35
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I am gonna create my own shading routine for each of the object in my game. Therefore, I will need to use Vertex and Pixel Shader for this. Due to this, I can't use the DBpro command like:

- ROTATE OBJECT
- POSITION OBJECT
- SCALE OBJECT

All object transformation like rotation, translation, and scaling need to be done in my vertex shader routine.

Is there anyway to access the object's internal transformation matrix so that I can pass them directly to my vertex shader? Right now, the only way I can think of is to create the matrix myself and fill them with the appropriate object's transformation data by calling OBJECT POSITION, OBJECT ROTATION, etc.

Any better ideas? Thanks!
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Rob K
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Posted: 31st May 2003 20:52
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Maybe SET VERTEX SHADER STREAM can help?

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Bulleyes
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Posted: 1st Jun 2003 05:20
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Erm.. thanks Rob. But I think you got me wrongly.

SET VERTEX SHADER STREAM is just for setting the properties, i.e. position, normals, diffuse color, etc. that you want them to appear in the vertex shader input registers.

What I meant is, how do I get the transformation matrix (rotation, translation and scale matrix) of a model (or OBJECT in the context of DBpro), so that I can passed them to the vertex shader via SET VERTEX SHADER MATRIX.

Thanks!

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The Darthster
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Posted: 1st Jun 2003 14:23
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I don't know much about the 3d maths commands, but can you use rotate ypr matrix4, scale matrix4 and translate matrix4 with the properties of the object to get the desired matrix?

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Bulleyes
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Posted: 1st Jun 2003 16:38
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Yes, that's the only way I can think of now. I was just wondering is there any other easier way to do this? Maybe just need a command to get the object transformation matrix?

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ozak
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Posted: 2nd Jun 2003 16:40
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Aren't these passed in constant registers to the vertex shader?
(Just a guess, havent' touched shaders in a while
Check the DirectX SDK docs for this

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Bulleyes
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Posted: 3rd Jun 2003 16:17
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Yes, you got it ozak! Those transformation matrix will be eventually passed into my vertex shader using constant register.

The question is, whether is there any shortcut I can get the transformation matrix of an object? The way that I do now is,

1. Create a matrix
2. Set the position of the object into the matrix.
3. Create another matrix
4. Set the rotation of the object into it.
5. Create another matrix.
6. Set the scale of the object into it.
7. Concatenate all 3 matrices into one single matrix using matrix multiplication.

The concatenated matrix is what I meant by object transformation matrix. The question is, whether is there any shortcut to get this matrix, without going through all those hassles? I believe DBpro will have this matrix store internally, just that whether it is accessible to programmers or not.

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The Darthster
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Posted: 3rd Jun 2003 18:52
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I assume you're not multiplying those matrices together in the same order as you created them. Can't you just work out the complete matrix on paper first then feed the correct values in afterwards?

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Bulleyes
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Posted: 4th Jun 2003 05:42
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Nope, I can't. The position and rotation of the object will change every frame.

Oh, BTW, the multiplication order of the matrices are
Scaling * Rotation * Translation

Is that correct?

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The Darthster
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Posted: 4th Jun 2003 17:26
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You can work out the matrix using variables as the position and angles on paper, and then just substitute the numbers in, no?

Yeah that looks right to me. I suppose if you were translating before you rotated you'd probably have noticed by now.

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