[osg-users] "LOS" materail query

[Robert Osfield]

Hi Mike,

The osgparticleeffects demo uses a ShapeDrawable for rendering the terrain,
this keeps the code straight forward but it does mean there isn't an
osg::Geometry for the vertices and tex coords to hang off as all the
geometry data is created on the fly and embedded in a display list.  Please
remember this example is written to demonstrate how to do particle effects,
it's not an example for rendering terrain etc.

Try using a scene graph that actually use osg::Geometry and you shoudl have
better luck.

Robert.


On 26 August 2015 at 13:24, Mike Greene <mgreene at hiwaay.net> wrote:

> Yes, a null texture is the problem. I am using the osgparticleeffects
> example, as I know the object does have a texture. It is the example where
> you click on the terrain and at that point an explosion and smoke effect
> starts.
>
> But when printing out the coordinates of "hit" in the code above, they do
> show valid locations on the terrain whenever a mouse "clicks" on the
> terrain to place a particle effect. Using one of these valid "hits", I then
> use that intersection to try the texture return code.
>
> For example, one of the hit outputs that I ran returned an X,Y,Z of
> 838.203, 840.662, 268.477 (LocalIntersectPoint), but the texture returned
> is NULL and of course then tc is (0,0,0).
>
> Debugging the code for getTextureLookup, the first two lines :
>
> Code:
>
> osg::Texture*
> LineSegmentIntersector::Intersection::getTextureLookUp(osg::Vec3& tc) const
> {
>     osg::Geometry* geometry = drawable.valid() ? drawable->asGeometry() :
> 0;
>     osg::Vec3Array* vertices = geometry ?
> dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray()) : 0;
>
>
>
>
> show that drawable.valid is true, but then the value of vertices is always
> all zeroes.
> ...
>
> Thank you!
>
> Cheers,
> Mike[/code]
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=64903#64903
>
>
>
>
>
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