pelado

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?

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?

auto_material-and-jit-gl-sketch

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.

hey 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.

hey 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.

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?

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 ...

looks 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.

Yes, it works as you said.
Thank you Rob.
