Trying to resize my objects

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Last post 10/26/2009 4:47 PM by manswide. 6 replies.

10/26/2009 9:53 AM

manswide

(0)
Posts 13

Trying to resize my objects

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Hi, I'm making a little game where the player is transforming 2D-objects into 3D. It sounds simple enough, but I find it very hard.

I'm using this line of code:

effect.World = worldMatrix * transforms[mesh.ParentBone.Index];

where worlMatrix could be something like (1,000000.1,1) to display a 3D-object as a 2D-object. But this causes the object to automaticly position itself at Z=0.

Does anyone know how I can resize/transform an object without moving it?

regardes,

Måns Wide

10/26/2009 9:59 AM

In reply to

manswide

(0)
Posts 13

Re: Trying to resize my objects

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I should add this: the worldMatrix is the position of the object multiplied with a scale (and THAT would be something like (1,0000.1,1)).

worldMatrix = position * Matrix.CreateScale(bX, bY, bZ);

10/26/2009 11:24 AM

In reply to

Antoine

(429)
Posts 332

Re: Trying to resize my objects

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manswide:
I should add this: the worldMatrix is the position of the object multiplied with a scale (and THAT would be something like (1,0000.1,1)).

worldMatrix = position * Matrix.CreateScale(bX, bY, bZ);

Isn't the scale to be done before the translation ?
Also, isn't "transforms[mesh.ParentBone.Index]" before anything ?

You speak English, Spanish or French ? You need tutorials in your language ? You can make tutorials in your language ? Check : this site

10/26/2009 1:05 PM

In reply to

manswide

(0)
Posts 13

Re: Trying to resize my objects

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I don't know, since I'm multiplying, I pressumed the order wouldn't metter. How would it look like with your order?

10/26/2009 1:13 PM

In reply to

Antoine

(429)
Posts 332

Re: Trying to resize my objects

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manswide:
since I'm multiplying, I pressumed the order wouldn't metter

Not true. Indeed, what you are multiplying are matrices, which is different from the "basic" multiplication of numbers. if A and B are matrices, A*B is different from B*A. I know the order is very important in the world matrix. I don't have any code with me now, but I think I firstly do the "transforms[mesh.ParentBone.Index]" then the scale, and I don't remember which is the first between rotation and translation.

You speak English, Spanish or French ? You need tutorials in your language ? You can make tutorials in your language ? Check : this site