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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Anytime we need to display text on screen, we have to do text rendering.
<span style="font-size: 13.3333px;">This would probably be a smaller bottleneck anyway, but text in 3D environments will be necessary for VR simulations that need text.</span><span style="font-size: 10pt;"> Do you know whether this would be a commonly used
feature for the type of applications that use iMSTK?</span>
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<div id="divRpF870508" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>From:</b> Andinet Enquobahrie [andinet.enqu@kitware.com]<br>
<b>Sent:</b> Monday, October 24, 2016 7:18 PM<br>
<b>To:</b> Milef, Nicholas Boris<br>
<b>Cc:</b> imstk-developers@imstk.org<br>
<b>Subject:</b> Re: [Imstk-developers] Text Rendering<br>
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<div dir="ltr">Nick,
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<div>But, are we doing any text rendering in iMSTK?</div>
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<div class="gmail_quote">On Mon, Oct 24, 2016 at 7:14 PM, Milef, Nicholas Boris <span dir="ltr">
<<a href="redir.aspx?REF=GcaQIKykAf_p3U92afkjAfkcR6JBs14ytzeQbMTcl_vemiGvZPzTCAFtYWlsdG86bWlsZWZuQHJwaS5lZHU." 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">One thing we may want to look into is optimizing text rendering. I think VTK uses FreeType, but that method has historically been slow for high-performance real-time applications
because you essentially have to render out each character at a certain resolution (which is bad for 3D text especially since the render size would need to change with distance).
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<div>Valve published an influential paper here that works well in 2D and 3D:</div>
<div><a href="redir.aspx?REF=1fm5UykOzXr3tI-V-rnL8JEZxa8GofNa8dtQklaZ9AHemiGvZPzTCAFodHRwOi8vd3d3LnZhbHZlc29mdHdhcmUuY29tL3B1YmxpY2F0aW9ucy8yMDA3L1NJR0dSQVBIMjAwN19BbHBoYVRlc3RlZE1hZ25pZmljYXRpb24ucGRm" target="_blank">http://www.valvesoftware.com/<wbr>publications/2007/<wbr>SIGGRAPH2007_<wbr>AlphaTestedMagnification.pdf</a><br>
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<div>Also, there's some interesting discussion in this answer here:</div>
<div><a href="redir.aspx?REF=L9ceArDG43rIPBojqyK2Tdcb-8qhHD1R5mMe9zNttRfemiGvZPzTCAFodHRwOi8vc3RhY2tvdmVyZmxvdy5jb20vcXVlc3Rpb25zLzUyNjI5NTEvd2hhdC1pcy1zdGF0ZS1vZi10aGUtYXJ0LWZvci10ZXh0LXJlbmRlcmluZy1pbi1vcGVuZ2wtYXMtb2YtdmVyc2lvbi00LTE." target="_blank">http://stackoverflow.com/<wbr>questions/5262951/what-is-<wbr>state-of-the-art-for-text-<wbr>rendering-in-opengl-as-of-<wbr>version-4-1</a></div>
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<div>What's interesting is that one approach is to model text essentially as a mesh and use geometry shaders to create planes out of the vertices to map the textures on them. IDK how great that approach is though because geometry shaders don't tolerate generating
geometry very well, but it's an option. Otherwise, instancing should work well enough.</div>
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<div dir="ltr">Andinet Enquobahrie, Ph.D., MBA<br>
Assistant Director of Medical Computing<br>
Kitware, Inc.<br>
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<a href="redir.aspx?REF=UcbyTjHf0Zc5067o0PP1gs2m54iM8yQJDlREvU_iFQbemiGvZPzTCAFodHRwOi8vd3d3LmtpdHdhcmUuY29t" target="_blank">http://www.kitware.com</a></div>
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