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The following surface has alpha values = 1, GL Alpha test and blending are disabled using a Jzy3d Quality < Advanced, e.g. Intermediate or Fastest.

This does not occur with Alpha test and blending enabled with Quality.Advanced.

Polygon offset fill - a trick to avoid this kind of glitch - is not supported yet by jGL.

Polygon Offset Fill was added to OpenGL 2 Specification (https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glPolygonOffset.xhtml) while jGL implements OpenGL 1. There is thus a need to implement offset filling.

I did not find yet a way to cleanly pass pixels to jGL (see my code mess in EmulGLPainter.glDrawPixels).

Moreover : rendering an image with a viewport discard the ability to render something else in another viewport.

For the moment I skipped the traditional GL approach and replaced with AWT image rendering in

GL.appendImageToDraw(BufferedImage image, int x, int y)

Text is currently simply printed over the image of the 3d scene.

Read depth buffer to guess if a text should be rendered before or after the image of the 3d scene.

Example of Axis labels that render on top of surface polygons instead of under.

when invoking gl.glColor4f( any, any, any, 0f) for a set of polygons, they appear completely black

when involking with an intermdiate alpha value such as 0.5f, the polygons appear darker

I found out that the color buffer contains black translucent pixels where nothing is drawn, and black opaque pixels where polygons should be drawn.

When integrated into Jzy3d, hence rendering multiple frames, the frames overlap despite clearing the colorbuffer between each frame with

glClearColor(white)
glClear(GL_GL_COLOR_BUFFER_BIT) 

Moreover, the background of the rendered image remains translucent instead of being reset with the background color.

Versions : Mac OS Catalina (10.15.3) / Intel Iris Graphics 6100 1536 Mo / JDK 1.8.0_91 / jGL 2.5 / Jzy3d 2.0

Problem not visible on other Mac OS version.

Functions like glutDisplayFunc that accepts callback function name as an argument could have overloaded counterparts that accept lambda as an argument.
I.e. instead of
public void glutDisplayFunc(String func) one could have public void glutDisplayFunc(Callable func) - this would increase performance (of course marginally) and code readability due to IDE code navigation support

Occurs on : Mac OS Catalina (10.15.3) / Intel Iris Graphics 6100 1536 Mo / JDK 11.0.4 / Jzy3d 2.0
Does not occur on : Mac OS Sierra (10.12.6) / Intel HD Graphics 4000 1536 Mo / AdoptOpenJDK 14 / Jzy3d 2.0

See this suggestion to use a JVM based font rendering to avoid portability issues.