auto_material and jit.gl.sketch
Sep 08 2008 | 6:36 pm
I've just written a patch and small article for my website about lighting in
Jitter. The idea is not so much a tutorial as an exploratory approach to
finding out how lighting is tackled in Jitter. However, coming to test the
patch I'm completely stumped by something regarding auto_material and
jit.gl.sketch. If I disable auto_material and draw something in sketch, say
'drawobject gridshape 1', material parameters have no affect on the
lighting/colour of the scene, but altering the colour parameters does. This
is not what I expected and indeed is not what happens with other jitter
objects. Am i missing something totally obvious?
pelado
Here is a patch that shows what I mean
- Sep 08 2008 | 7:41 pmhey pelado. you are correct. for normal gl objects, with lighting_enable 1 and auto_material 0, color attribute will be ignored and mat_diffuse, mat_specular, mat_ambient will be used.it looks like gl.sketch is ignoring the mat_diffuse and mat_ambient, and just using color even with @auto_material 0. not really sure why this is, but i will try to find out. mean time, using color instead of mat_diffuse has the exact same effect.also gl.sketch command "glmaterial diffuse 1 1 1 1" should also have the same result as @mat_diffuse 1 1 1 1.-rob
- Sep 09 2008 | 12:40 amhey pelado, turns out it was an intentional decision (not a bug) to keep control of material state in gl.sketch with the appropriate gl calls as i described in previous email.if you run into a problem with this, please let us know, otherwise it probably won't be changing anytime soon.
- Oct 06 2008 | 4:29 pmHello,I can't understand why @inherit_material 1 only works if one gridshape is in my patch.With 2 gridshape objects the attribut doesn't work? Strange ...
- Oct 06 2008 | 4:39 pmlooks like it requires you to either enable inherit_material on both shapes OR @automatic 0 and explicitly bang the the inherited material shape before the non-inherited material shape.
- Oct 06 2008 | 6:16 pmYes, it works as you said. Thank you Rob.
