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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Thanks Sebastian,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">I’m simply trying to get the alpha value of the diffuse component of the material properties, because I have to pass it to an underlying<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">graphic library that I use for rendering that custom drawable.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">BTW, I further investigated.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">In the following function:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:windowtext;mso-fareast-language:IT">State::captureCurrentState(StateSet& stateset)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">The _attributeMap actually contains as MATERIAL attribute exactly the pointer to the osg::Material property that I created.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">But in the attribute stack it appears as the ‘last_applied_attribute’, and ‘changed’ is set to true.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">For all other attributes the pointers stored in ‘last_applied_attribute’ are correct as well, but ‘changed’ is set to false.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Also, in that AttributeStack the member attributeVec contains just one element, that is not the correct one (it points to a different osg::Material).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">While for all the other attributes, which have ‘changed’ set to false, last_applied_attribute coincides with the first element in attributeVec.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">I don’t know anything of that code, but I don’t understand why osg::Material appears to be changed while other attributes not.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Or should I use a different API to get the current osg::Material?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Gianluca Natale<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="color:windowtext;mso-fareast-language:IT">From:</span></b><span lang="EN-US" style="color:windowtext;mso-fareast-language:IT"> osg-users [mailto:osg-users-bounces@lists.openscenegraph.org]
<b>On Behalf Of </b>Sebastian Messerschmidt<br>
<b>Sent:</b> marted́ 23 giugno 2015 18:15<br>
<b>To:</b> OpenSceneGraph Users; Osg Users<br>
<b>Subject:</b> Re: [osg-users] issue about getting the material properties from the current state in rendering info<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-fareast-language:IT"><o:p> </o:p></span></p>
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<p class="MsoNormal">Am 23.06.2015 18:05, schrieb Gianluca Natale:<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-US">Hi all,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’m using OSG 3.0.1.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have an issue when I try to retrieve the material properties from the rendering info, in my custom drawable.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">To be clearer:</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have a custom drawable, for which I implemented a</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">myDrawable::drawImplementation(osg::RenderInfo& osgRenderInfo).</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">When I try to get the material properties inside that function, by following code:</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">osg::StateSet drwbStateSet;</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">osg::State *state = osgRenderInfo.getState();</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">state->captureCurrentState(drwbStateSet);</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">the returned material properties is invalid.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Specifically, I put a breakpoint in following function:</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">StateSet::setAttribute(StateAttribute *attribute, StateAttribute::OverrideValue value)<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"> <o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">that is called inside captureCurrentState.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">When the attribute is an osg::Material, the _ptr is different from the one allocated when the material has been set, in the state set associated to a parent node of that drawable.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Furthermore, _userDataContainer is 0x0000000000000000, so no valid osg::Material is returned in the captured state set.</span><o:p></o:p></p>
</blockquote>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:IT">User data defaults to nullptr. So if you're not setting it up that is expected.<br>
As you don't explain why you are trying to inspect state during draw it is hard to guess what you are after.<br>
I simply guess that your state is set up somewhere further up in the stategraph (i.e. in one of the parents) and that state is set up lazy.
<br>
Maybe Robert can give some insights here. <br>
<br>
<br>
<br>
<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Any idea of the possible cause of the issue? Where did I go wrong?</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">BTW, all other attributes (polygon offset, polygon mode, etc…) are returned correctly.</span><o:p></o:p></p>
</blockquote>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:IT">Are you sure you are setting up an osg::Material state attribute somewhere?<br>
<br>
<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Gianluca Natale</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:IT"><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>osg-users mailing list<o:p></o:p></pre>
<pre><a href="mailto:osg-users@lists.openscenegraph.org">osg-users@lists.openscenegraph.org</a><o:p></o:p></pre>
<pre><a href="http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org">http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org</a><o:p></o:p></pre>
</blockquote>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:IT"><o:p> </o:p></span></p>
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