Re: [osg-users] what should I dirty when I change ColorArray on the fly?

[Claudio Benghi]

Hi Nick,
indeed, that works.
Thank you,
Claudio

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Re: [osg-users] what should I dirty when I change ColorArray on the fly?

[Trajce Nikolov NICK]

Hi Claudio,

it depends how your Geometry is setup. You might need to call
osg::Geometry->dirtyDisplayList() or if you use VertexBufferObjects you
might need to call colorArrays->getBufferObject()->dirty()

On Mon, Oct 14, 2019 at 11:16 PM Claudio Benghi 
wrote:

> Hello All,
>
> I have implemented a colour change visitor along the lines of the class
> found at:
> http://www.vis-sim.com/osg/code/osgcode_color1.htm
>
> While debugging I note that the following code is executed, including the
> colorArrays->dirty(), but the colour in the render is not affected.
>
> Could it depend from the way in which the colorArray is initialliy
> instantiated?
> Should I mark some state as Dynamic?
>
>
> Code:
>
> void XbimNodeColorVisitor::apply(osg::Geometry )
> {
>   osg::Vec4Array *colorArrays = dynamic_cast *>(curGeom.getColorArray());
>   if (colorArrays) {
> for (unsigned int i = 0; i < colorArrays->size(); i++) {
>   osg::Vec4 *color = >operator [](i);
>   color->set(m_color._v[0], m_color._v[1], m_color._v[2],
> m_color._v[3]);
> }
> colorArrays->dirty();
>   }
>   else {
> // code never enters this path
>   }
> }
>
>
>
>
>
> Thank you!
>
> Cheers,
> Claudio
>
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> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=76829#76829
>
>
>
>
>
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Re: [osg-users] what should I dirty when I change ColorArray on the fly?

[Claudio Benghi]

Hi again,

I think I've solved my issue.

I've worked out that BufferObject::dirty() does not yield a result because 
_glBufferObjects[i].valid() is false. This is probably because I was not using 
VBOs on those geometries. If I create the geometry with 
setUseVertexBufferObjects(true) the code works.

Otherwise I've found that curGeom.dirtyDisplayList(); updates the geometry if 
setUseVertexBufferObjects() is not invoked.

Just writing it here in case it helps somebody else.

Thank you!

Cheers,
Claudio

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Re: [osg-users] what should I dirty when I change ColorArray on the fly?

[Claudio Benghi]

Hello All,

I have implemented a colour change visitor along the lines of the class found 
at:
http://www.vis-sim.com/osg/code/osgcode_color1.htm

While debugging I note that the following code is executed, including the 
colorArrays->dirty(), but the colour in the render is not affected.

Could it depend from the way in which the colorArray is initialliy 
instantiated? 
Should I mark some state as Dynamic?


Code:

void XbimNodeColorVisitor::apply(osg::Geometry )
{
  osg::Vec4Array *colorArrays = dynamic_cast(curGeom.getColorArray());
  if (colorArrays) {
for (unsigned int i = 0; i < colorArrays->size(); i++) {
  osg::Vec4 *color = >operator [](i);
  color->set(m_color._v[0], m_color._v[1], m_color._v[2], m_color._v[3]);
}
colorArrays->dirty();
  }
  else {
// code never enters this path
  }
}



 

Thank you!

Cheers,
Claudio

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Re: [osg-users] what should I dirty when I change ColorArray on the fly?

[Trajce Nikolov NICK]

yes :) .. Thanks Glenn .. I totally missed that

On Wed, May 3, 2017 at 8:54 PM, Glenn Waldron  wrote:

> Nick,
> If you have VBOs enabled, I think you just have to call dirty() on the
> color array itself.
>
>
> Glenn Waldron
>
> On Wed, May 3, 2017 at 2:43 PM, Trajce Nikolov NICK <
> trajce.nikolov.n...@gmail.com> wrote:
>
>> Hi community,
>>
>> this is simple question. I am updating the Color array of a osg::Geometry
>> on the fly. It is not having effect. The Geometry is not using displaylist.
>> How/What should I do to have the color mods "updated" in the rendering
>> correctly?
>>
>> Thanks a bunch as always?
>>
>> --
>> trajce nikolov nick
>>
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>


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Re: [osg-users] what should I dirty when I change ColorArray on the fly?

[Glenn Waldron]

Nick,
If you have VBOs enabled, I think you just have to call dirty() on the
color array itself.


Glenn Waldron

On Wed, May 3, 2017 at 2:43 PM, Trajce Nikolov NICK <
trajce.nikolov.n...@gmail.com> wrote:

> Hi community,
>
> this is simple question. I am updating the Color array of a osg::Geometry
> on the fly. It is not having effect. The Geometry is not using displaylist.
> How/What should I do to have the color mods "updated" in the rendering
> correctly?
>
> Thanks a bunch as always?
>
> --
> trajce nikolov nick
>
> ___
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> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>
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[osg-users] what should I dirty when I change ColorArray on the fly?

[Trajce Nikolov NICK]

Hi community,

this is simple question. I am updating the Color array of a osg::Geometry
on the fly. It is not having effect. The Geometry is not using displaylist.
How/What should I do to have the color mods "updated" in the rendering
correctly?

Thanks a bunch as always?

-- 
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