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<p style="margin-top:0;margin-bottom:0">Hi David,</p>
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<p style="margin-top:0;margin-bottom:0">thanks for the infos about the vtkPolyDataToImageStencil filter threaded approach. </p>
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<p style="margin-top:0;margin-bottom:0">Is there some way with the available vtk filters to rasterize the polygons themselves instead of rasterizing the volume enclosed by the polygons?</p>
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<p style="margin-top:0;margin-bottom:0">I know, i could in some way misuse the vtk renderer to do this by rendering the mesh
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without any shading, only in ambient, completely white with orthogonal projection etc. </span>in a black render window, sized to the voxel resolution, then read the resulting screen pixels with the vtkWindowToImage Filter, <span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">fill
the vtkImageData where i have white pixels,</span> change the clipping planes to the next slice, draw the mesh again, read again ... and do that slice by slice for the depth part of the voxel resolution:</p>
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<p style="margin-top:0;margin-bottom:0"><img size="6802" contenttype="image/png" id="img641417" tabindex="0" style="max-width: 99.9%; user-select: none;" data-outlook-trace="F:1|T:1" src="cid:4ffb8812-3732-4885-bb29-4da9ff0b3467"><br>
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<p style="margin-top:0;margin-bottom:0">But are the<span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"> available </span><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">vtk
filters able in some way to rasterize the polygons themselves ?</span><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"></span></p>
<p style="margin-top:0;margin-bottom:0"><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><br>
</span></p>
<p style="margin-top:0;margin-bottom:0"><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">Or could it be done with
some kind of signed distance field filter (i don't know if there is something in vtk)?</span></p>
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Thanks again.
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<div>Cheers,</div>
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<div>Berti<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Von:</b> David Gobbi <david.gobbi@gmail.com><br>
<b>Gesendet:</b> Samstag, 29. September 2018 03:44<br>
<b>An:</b> Berti Krüger<br>
<b>Cc:</b> VTK Users; Csaba Pinter<br>
<b>Betreff:</b> Re: [vtkusers] Solid Voxelization with VTK</font>
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<div dir="ltr">Hi Berti,
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<div>It's nice to see that the orientation voting gives such a clean result. To get a result without gaps it would be necessary to take a completely different approach to the rasterization: rasterize the polygons themselves, instead of rasterizing the volume
enclosed by the polygons.</div>
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<div>Neither of the filters is parallel. I designed them both so that they could be parallel, but I never wrote the threading code because they already worked fast enough for my application.</div>
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<div>For instance, vtkPolyDataToImageStencil has this method:</div>
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<div> void vtkPolyDataToImageStencil::ThreadedExecute(</div>
<div> vtkImageStencilData *data,</div>
<div> int extent[6],</div>
<div> int threadId)</div>
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<div>The vtkImageStencilData object is made so that it can be written and read in a thread-safe manner, so in order to multithread this filter, one would just have to subdivide the extent along Z and then write a threaded "For()" loop, e.g. with vtkSMPTools.h.</div>
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<div> - David</div>
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