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    <p>Hi Gil,</p>
    <p>I'm pretty sure that's because you are using the PhongMaterial
      which only writes to Depth and Color0. You'd need to have your own
      material which writes to 3 different outputs to properly populate
      the 3 color attachments.</p>
    <p>Paul<br>
    </p>
    <div class="moz-cite-prefix">On 8/1/19 7:42 PM, Gil H wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:97981209-375A-41E4-A3CA-4817D24B5C99@tastytech.ca">
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        <p class="MsoNormal"><span style="font-size:11.0pt">Hello
            everyone, I’m sure I’m doing something wrong here, but
            basically, I’m trying to render multiple frame graph
            subtrees into multiple texture targets, and then draw those
            as part of the final scene (kind of like seeing security
            camera feeds on a few textured quads).  Attached is my
            minimal test app which shows that only textures attached to
            Color0 seem to contain anything.  Is it because the surface
            is a QWindow?  I’ve tried a more complicated example with an
            offscreen render surface and an FBO with multiple color
            attachments added to it, but the textures I got back from
            that were still empty.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Tested this
            on Mac with Qt 5.13.0.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">If anyone is
            curious about why you would want to do this, I need to
            render up to 3 different Qt3D scenes for integration into an
            external GL engine.  So different camera views and scene
            sub-trees need to be drawn onto separate textures each
            frame.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
Interest mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Interest@qt-project.org">Interest@qt-project.org</a>
<a class="moz-txt-link-freetext" href="https://lists.qt-project.org/listinfo/interest">https://lists.qt-project.org/listinfo/interest</a>
</pre>
    </blockquote>
    <pre class="moz-signature" cols="72">-- 
Paul Lemire | <a class="moz-txt-link-abbreviated" href="mailto:paul.lemire@kdab.com">paul.lemire@kdab.com</a> | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel: France +33 (0)4 90 84 08 53, <a class="moz-txt-link-freetext" href="http://www.kdab.fr">http://www.kdab.fr</a>
KDAB - The Qt, C++ and OpenGL Experts</pre>
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