plib-users

[Plib-users] Cutout usage

[Paolo L. <p.l...@ci...>]

I'm trying to use ssgCutout nodes in a modified version of the 3DS loader
for supporting 3DS "billboard" objects - not to mention that can't get the
expected result! (e.g. objects staying always parallel to the screen ...).

What I did is in the following code:

...
  ssgVTable *v = new ssgVTable( GL_TRIANGLES, vertex_count, vertices,
				normal_count, normals,
				texcrd_count, texcrds,
				0, NULL);
  if ( object_name != (char *)NULL ) {
    v -> setName( object_name );
    object_name = (char *)NULL;			// global from parse_objblock()
  }
  v -> setState( state );
  if ( strstr( v->getName(), "bboard" ) > 0 ) {	// N E W  C O D E
    ssgCutout *bboard = new ssgCutout(FALSE);
    bboard->addKid( v );
    current_transform -> addKid( bboard );
  }
  else							// E N D  N E W  C O D E
    current_transform -> addKid( v );
...

Just for try, in 3DS I gave "billboard" object name to *bboard* for
detecting beyond the 3DS storing format (and they are actually detected).
The graph organization I implemented is the following (slightly different
from the original one coded in the 3DS loader from Per):

original:
			root
			  |
	    +---------+-------+
	    |                 |
	transform ...	transform
	    |                 |
	 vtable ...		vtable

w cutout (when present):
			root
			  |
	    +---------+-------+
	    |                 |
	transform ...	transform
	    |                 |
	 vtable ...		cutout
				    |
				vtable

The result is simply those objects are no longer (visible) in the scene,
both with ssgCutout(TRUE) and ssgCutout(FALSE). Can anybody tell me why? (my
billboard objects have origin at their center).

Thanks in advance -

Re: [Plib-users] Cutout usage

[Per L. <li...@ho...>]

Paolo Leoncini wrote:
> What I did is in the following code:
> 
> ...
>   ssgVTable *v = new ssgVTable( GL_TRIANGLES, vertex_count, vertices,
>                                 normal_count, normals,
>                                 texcrd_count, texcrds,
>                                 0, NULL);

:-O I just discovered that the changes I made some month ago, where the
3DS loader switched from ssgVTable to ssgVtxTable must have got lost
somewhere! If I understood Steve correct, ssgVTable should be phased out
of all plib code, so we should switch to ssgVtxTable ASAP, and then work
from that. I can make the changes tonight, if you don't feel like doing
it, Paolo.

Regards,
Per Liedman

-- 
===========================================================================
Per Liedman                                       
md...@md...
Nilssonsberg 7                       
http://www.mdstud.chalmers.se/~md6pl/
411 43 Göteborg                               tel: 031-825659 /
0705-520455
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