Jqt supports opengl 2 or newer. On Mar 8, 2015 4:50 AM, "Raul Miller" <[email protected]> wrote:
> For texture mapping, I think you'd need to abandon plot (at least as > it is currently written) and move over to opengl. > > For opengl, you either need to drop back to earlier versions of J (J6 > and J7 both had opengl labs - albeit with differences in the details) > or you'll need to explore the webgl capabilities inherent in JHS or > you'll need to temporarily abandon J while you learn the ropes > (perhaps at shadertoy) and then maybe bring your knowledge back into > the community. > > References: > > http://www.jsoftware.com/jwiki/OpenGL > > > http://webglplayground.net/documentation > > https://www.shadertoy.com/results?query=tag%3Dtexture > > Or, if you are less inclined towards experimentation and prefer some > heavy reading: > > https://www.cse.msu.edu/~cse872/tutorial4.html > > https://www.opengl.org/archives/resources/faq/technical/texture.htm > > http://www.glprogramming.com/red/chapter09.html > > ... > > Beware though that the opengl standards have drifted over the years > and there will be subtle gotchas where some older things no longer > work and some newer things don't quite work exactly like they are > described to work. > > What usually works for me is some time spent finding out what the > puzzling terms mean, and then some blind experiments based on some > working example - go back and forth on that enough and mix in some > attempts to create things from scratch (which helps identify blind > spots). But I also like to stay close to working examples, as much as > I can, to avoid too much time lost on blind alleys (where someone with > more self importance than practical sense says something which sounds > plausible but which is totally unrelated to what you want to be > doing). > > Thanks, > > -- > Raul > > On Sat, Mar 7, 2015 at 3:10 PM, Skip Cave <[email protected]> wrote: > > My next challenge is to map a texture (rectangular .jpg image) onto that > > ellipse and plane. Any hints as to how to do that? > > > > Skip Cave > > Cave Consulting LLC > > > > On Sat, Mar 7, 2015 at 1:35 PM, Skip Cave <[email protected]> > wrote: > > > >> Raul, Thanks for the links! That's what I needed. I didn't think about > >> looking in the Studio Labs for the Plot documentation. The final secret > is > >> to throw away the imaginary parts of the ellipse equation so all z > outside > >> the ellipse is zero: > >> > >> a =.1 > >> > >> b=. 1.7 > >> > >> c =. 1.5 > >> > >> x =. 5 %~21 21 $ i:10 > >> > >> y =. |: x > >> > >> z =. {. |: +. c * ((1 - ((x^2)%(a^2)) + ((y^2)%(b^2))))^0.5 > >> > >> 'surface' plot z > >> > >> > >> Here's the plot: http://bit.ly/1GbYuy1 > >> > >> > >> The axes should be 1, 1,7 and 1.5, but they are not, so I need to look > at > >> that. > >> > >> > >> Skip > >> > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
