<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I recompiled VTK beforehand with the -DVTK_RENDERING_BACKEND:<wbr>STRING=OpenGL2<br>
flag. Is OpenGL3 a thing?<br></blockquote><div><br></div><div>No, VTK_RENDERING_BACKEND:<wbr>STRING=OpenGL2 is indeed what you want.</div><div><br></div><div>Also make sure before you create the QApp in your main, you're calling `QSurfaceFormat::setDefaultFormat(QVTKOpenGLWidget::defaultFormat())`. Is that the case?<br></div></div></div></div>