<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m creating a simple volume from vtkImageData using vtk.js.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I create an empty 3d vtkImageData and set it up with a mapper and actor, and add it to the renderer.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I create a transfer function that has 0 = blue, 100 = red, 1000 = green.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m trying to set pixels directly in the volume.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>There’s two problems – <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The first is that when I click anywhere on the screen the volume disappears…it shows on the first render call.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have a button that is used to trigger the voxel setting. This seems to work only on the first slice of voxels, and the rest seem to not “stick”.<o:p></o:p></p><p class=MsoNormal>Regardless, however, the render call makes the volume disappear.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My code is here:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><a href="https://github.com/DominionSoftware/TestVolumeImage">https://github.com/DominionSoftware/TestVolumeImage</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>and can be built with the installation instructions like the other examples (this was cribbed from an example).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Anyone have any suggestions as to why the volume disappears, and / or ways to debug this?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Rick<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>