<div dir="ltr">It could be a few things, we would really need more details to narrow it down. Two things you can check<div><br></div><div>1) maybe a lighting issue, if you change your actors to be only ambient, no diffuse, do you still see the issue?</div><div><br></div><div>2) maybe a zbuffer issue, If you zoom too far you can end up with bad (not ideal) zbuffer clipping ranges. To narrow that down</div><div> - are these Actors or Actor2D, what mapper are you using, do you have overlapping or coincident geometry?</div><div> - when you see the problem what is the value of </div><div> - the camera's clipping range</div><div> - camera's position, and focal point, distance</div><div> - the bounds of your data</div><div><br></div><div>Generally you do not want any of those values to be really small or large relative to the square root of the range a float can normally hold.</div><div><br></div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Oct 17, 2016 at 5:28 PM, Patricio Palma C. <span dir="ltr"><<a href="mailto:patriciop@gmail.com" target="_blank">patriciop@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi experts, does anybody has any idea of what could causing the issue described in the previous email? <div>Recently I have noted that something similar occurs on 3D structures when zooming in extremely to the structure and then rotating it. It appears a kind of pattern to generate the shadow of the face but as you rotate the structure the face begin to get noisy.<span></span><div><br></div>My current setup is VTK git development branch using OpenGL2 as rendering backend. mesa 12.0.1 with AVX. I have also tried using mesa 11.2 and the results are the same.<div><br></div><div>Thanks!</div><div>Regards </div><div>Patricio <br><div><div><div><br>El Monday, October 3, 2016, Patricio Palma C. <<a href="mailto:patriciop@gmail.com" target="_blank">patriciop@gmail.com</a>> escribió:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Dear Experts</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">I'm using VTK 7.1 (latest Git version) and Mesa 12.0 with AVX. I have an application that display a 2D structure and some data on it. After zooming in a couple times in the same spot of the structure it begins to appear some noise over the 2D structure that increase after continuing zooming in.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Is this a known issue? is there a way to solve/avoid this?</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">I've attached some pictures showing how the noise appears while zooming in. </div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><img src="cid:ii_1578c199a013ae66" alt="Inline image 2" width="153" height="139"></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><img src="cid:ii_1578c19e566e43fc" alt="Inline image 3" width="143" height="140"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><img src="cid:ii_1578c1a6ba3cf124" alt="Inline image 5" width="142" height="156" style="margin-right:0px"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><img src="cid:ii_1578c1abf0c55f9b" alt="Inline image 6" width="116" height="151" style="margin-right:0px"><span class="HOEnZb"><font color="#888888"><br></font></span></div><span class="HOEnZb"><font color="#888888"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div>-- <br><div><div dir="ltr"><font face="arial, helvetica, sans-serif"><span style="font-size:16.3636px">Patricio Palma Contreras</span></font></div></div>
</font></span></div><span class="HOEnZb"><font color="#888888">
</font></span></blockquote></div></div></div></div></div><span class="HOEnZb"><font color="#888888"><br><br>-- <br><div dir="ltr"><font face="arial, helvetica, sans-serif"><span style="font-size:16.3636360168457px">Patricio Palma Contreras</span></font></div><br>
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