Posted by Martin on Dec 23, 2021; 12:03pm
URL: https://forum.jogamp.org/contour-lines-disappeared-when-zoom-in-3D-earth-coordinates-tp4041550p4041560.html

Hi,

I indeed use GL_POLYGON_OFFSET_FILL to draw polygon edges along a polygon face, but it was not working in the case of drawing contour on a flat surface.

Here is what I have with GL_POLYGON_OFFSET_FILL only



Now when using the stencil buffer trick



My two other motivation for using stencil were
- it also deals with text rendering
- polygon offset fill is available in JOGL, but not in jGL - the CPU renderer I use as fallback when native rendering is not possible