gdalgorithms-list

RE: [Algorithms] Creating the world matrix

[Paul D. <P_d...@cr...>]

Have a look here http://www.acm.org/tog/GraphicsGems/gems/MatrixPost.c it's
not quite what you want but it might help.

-----Original Message-----
From: Aldo . [mailto:al...@ho...]
Sent: Monday, July 17, 2000 3:00 PM
To: gda...@li...
Subject: [Algorithms] Creating the world matrix



Hi!

I'm looking for a fast way to create the world matrix from the values of 
pitch, yaw, roll and position(and scaling factor, perhaps), without using a 
matrix operation for each value.
I would like to avoid do the folowing

WorldMatrix = MatrixIdentity();

MatrixScale(WorldMatrix, scale);

MatrixTranslate(WorldMatrix, position);

MatrixRotateX(WorldMatrix, pitch);
MatrixRotateY(WorldMatrix, yaw);
MatrixRotateZ(WorldMatrix, roll);

SetWorldMatrix(WorldMatrix);


Yes, I know the code is not efficient, and perhaps wrong, but its only a 
example.

I'm using D3D Immediate Mode.

Any ideas?


Thanks in advance.

Aldo


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RE: [Algorithms] Creating the world matrix

[Steve W. <Ste...@im...>]

> From: Aldo . [mailto:al...@ho...]
>
> I'm looking for a fast way to create the world matrix from 
> the values of pitch, yaw, roll and position(and scaling factor, perhaps), 
> without using a matrix operation for each value.
> I would like to avoid do the folowing
> 
> WorldMatrix = MatrixIdentity();
> 
> MatrixScale(WorldMatrix, scale);
> 
> MatrixTranslate(WorldMatrix, position);
> 
> MatrixRotateX(WorldMatrix, pitch);
> MatrixRotateY(WorldMatrix, yaw);
> MatrixRotateZ(WorldMatrix, roll);
> 
> SetWorldMatrix(WorldMatrix);
> 

In the DirectX help Index select: 3-D Transformations.  It has details on
the matrices used for each method you list. If you want to hard code it into
your app to eliminate un-necessary operations then you'll want to break each
transform operation down to it's components and do the math.

R&R

RE: [Algorithms] Creating the world matrix

[Aldo . <al...@ho...>]

Thank you, Steve!

Aldo


>From: Steve Wood <Ste...@im...>
>Reply-To: gda...@li...
>To: "'gda...@li...'"  
><gda...@li...>
>Subject: RE: [Algorithms] Creating the world matrix
>Date: Mon, 17 Jul 2000 09:47:51 -0700
>
> > From: Aldo . [mailto:al...@ho...]
> >
> > I'm looking for a fast way to create the world matrix from
> > the values of pitch, yaw, roll and position(and scaling factor, 
>perhaps),
> > without using a matrix operation for each value.
> > I would like to avoid do the folowing
> >
> > WorldMatrix = MatrixIdentity();
> >
> > MatrixScale(WorldMatrix, scale);
> >
> > MatrixTranslate(WorldMatrix, position);
> >
> > MatrixRotateX(WorldMatrix, pitch);
> > MatrixRotateY(WorldMatrix, yaw);
> > MatrixRotateZ(WorldMatrix, roll);
> >
> > SetWorldMatrix(WorldMatrix);
> >
>
>In the DirectX help Index select: 3-D Transformations.  It has details on
>the matrices used for each method you list. If you want to hard code it 
>into
>your app to eliminate un-necessary operations then you'll want to break 
>each
>transform operation down to it's components and do the math.
>
>R&R
>
>_______________________________________________
>GDAlgorithms-list mailing list
>GDA...@li...
>http://lists.sourceforge.net/mailman/listinfo/gdalgorithms-list

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