Raul, Yes, I have, and had, read that buffer page. It does not shed light on your comment for me.
Regarding 'paint'ing, your comment makes sense, but is not prescriptive enough for me to move forward. I have experimented in several ways but with no usable results. For example, I tried the following verb. Upon entering `forward 0` in the Terminal all I notices is that the graphics pane had everything below its main diagonal permanently cleared of anything except the black background color. 3 lines of output are produced in the Terminal pane: 4 4 ; HI ; 0 . forward=: 3 : 0 wh=. gl_qwh'' glClearColor 1 1 1 1 glClear GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT glUseProgram sprog glEnable GL_DEPTH_TEST glEnable GL_CULL_FACE echo $mvp glUseProgram 0 echo'HI' gl_paint'' ) When I tried to put almost all of the current a_g_paint verb definition into forward, nothing happened in the graphics pane, but I think I got the same 3 lines in the Terminal pane. In neither case is an error raised. On Sat, Feb 29, 2020 at 6:29 PM Raul Miller <rauldmil...@gmail.com> wrote: > Have you read the second paragraph at > > https://www.khronos.org/registry/OpenGL-Refpages/es2.0/xhtml/glBindBuffer.xml > ? > > As for your paint issue--you're basically going to need instructions in the > paint callback which lays down geometry (or whatever) for your painted > surface. > > Does this make sense? > > Thanks, > > -- > Raul > > -- (B=) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
