Re: Planar shadows

You may still be able to clip without a shader - opengl has user clip planes
available in some versions, check your docs.

The alternative is you could not completely flatten your geometry, just
"mostly" flatten it so that it appears flat enough. Then you can still have
your matrix set up to keep the unwanted geometry below the ground plane, and
the depth test against the ground geometry will take care of it.

On Wed, Sep 29, 2010 at 3:57 PM, [email protected] <
[email protected]> wrote:

>  Thanks but it's OpenGL 1.0 for BlackBerry and 1.1 for Android.  So far
> my solutions is, well, don't push the rocks so far into the ground :)
>
> Leigh
>
> On 9/29/2010 11:53 AM, Jeff Russell wrote:
> > Yes there is - clip your shadow geometry against the ground plane
> > before it gets flattened. You can do this with the discard keyword in
> > your shadow pixel shader.
> >
> > Jeff
> >
> > On Tue, Sep 28, 2010 at 9:25 PM, [email protected]
> > <mailto:[email protected]> <[email protected]
> > <mailto:[email protected]>> wrote:
> >
> >      Hi,
> >
> >     I have hooked up planar shadows for my Android Tank game using a
> >     matrix
> >     to project all geometry onto the ground. The game has the luxury of
> >     having  a 2D battle field.  The problem is that I am using instanced
> >     rocks that are randomly rotated and pushed into ground.  So now I
> >     get a
> >     reverse shadow projected from underneath.  Is there any way to get
> rid
> >     of this?
> >
> >     Leigh
> >
> >
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> >
> >
> > --
> > Jeff Russell
> > Engineer, 8monkey Labs
> > www.8monkeylabs.com <http://www.8monkeylabs.com>
> >
> >
> >
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-- 
Jeff Russell
Engineer, 8monkey Labs
www.8monkeylabs.com

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