Re: Planar shadows

"[email protected]" <[email protected]> Thu, 30 Sep 2010 10:17:51 -0400
Newsgroups gmane.games.devel.algorithms
Message-ID <[email protected]>
  Thank you I will look into that.

On 9/29/2010 5:09 PM, Jeff Russell wrote:
> 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] 
> <mailto:[email protected]> <[email protected] 
> <mailto:[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]>
>     > <mailto:[email protected] <mailto:[email protected]>>
>     <[email protected] <mailto:[email protected]>
>     > <mailto:[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>
>     <http://www.8monkeylabs.com>
>     >
>     >
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> -- 
> Jeff Russell
> Engineer, 8monkey Labs
> www.8monkeylabs.com <http://www.8monkeylabs.com>
>
>
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