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<div style="font-family:Tahoma; font-size:13px">Thanks Ken! I'll give vtkPointGaussianMapper a try. It seems to be closest to what I want to do.
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<div id="divRpF165036" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>From:</b> Ken Martin [ken.martin@kitware.com]<br>
<b>Sent:</b> Tuesday, September 26, 2017 12:37 PM<br>
<b>To:</b> Milef, Nicholas Boris<br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Subject:</b> Re: [vtkusers] Creating billboard particle effects (e.g., smoke, fire)<br>
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<div dir="ltr">It depends on the specifics of the implementation but as a start
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<div>1) vtkPointGaussianMapper will draw billboard triangles and execute a possibly user defined sharer on them. This can be used to draw translucent splats/discs/squares/etc. based on the shader provided.</div>
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<div>2) if you are thinking more as point sprites (fixed pixel size as opposed to world coord size) you can use the regular polydata mapper with a point size and then shade it/texture it</div>
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<div>3) If you have 3D elements (as opposed to billboards) then you could use vtkGlyph3DMapper which under the hood uses opengl instancing to replicate geometry.</div>
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<div>4) if you mostly want spheres or cylinders then there are dedicated mappers for those which is what the molecule mapper uses under the hood. Those mappers have the code to properly compute z values based on sphere/cylinder equations so they are not exactly
billboards but more impostors.</div>
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<div class="gmail_quote">On Tue, Sep 26, 2017 at 12:12 PM, Milef, Nicholas Boris <span dir="ltr">
<<a href="mailto:milefn@rpi.edu" target="_blank">milefn@rpi.edu</a>></span> wrote:<br>
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<div style="direction:ltr; font-family:Tahoma; color:#000000; font-size:10pt">What would be the best way to create billboard particle effects such as smoke or fire? Should I use the vtkMoleculeMapper?
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<div>Example:</div>
<div><a href="http://www.opengl-tutorial.org/intermediate-tutorials/billboards-particles/particles-instancing/" target="_blank">http://www.opengl-tutorial.<wbr>org/intermediate-tutorials/<wbr>billboards-particles/<wbr>particles-instancing/</a></div>
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<div>Ken Martin PhD
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