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nootropic..

porting processing to jogl: how lights() works?

in Programming Questions • 2 years ago

hi!

i've been a nice prototype in processing with a bit of 3d surfaces and now i have to integrate all that code in a JOGL project and i'm not an opengl guy. i've played all night with glLight but i can't porting this ultra simple code:

lights();
fill(200);

i get some abient light and some directional light but they are not so simle&nice as the processing sketch.

some advice?

1

Replies(5)

kooogy

Re: porting processing to jogl: how lights() works?

2 years ago

the default settings for the processing lights() command are listed in the reference

http://processing.org/reference/lights_.html

" The defaults are are ambientLight(128, 128, 128) and directionalLight(128, 128, 128, 0, 0, -1), lightFalloff()(1, 0, 0), and lightSpecular(0, 0, 0)."

nootropic..

Re: porting processing to jogl: how lights() works?

2 years ago

ok i tried to do it but with no result..

private void lights(GL gl) {
gl.glEnable(GL.GL_LIGHTING);
gl.glShadeModel(GL.GL_SMOOTH);
float color[] = {0.2f,0.2f,0.2f,1.0f };
gl.glLightfv(GL.GL_LIGHT0, GL.GL_AMBIENT, color,0);
gl.glEnable(GL.GL_LIGHT0);
gl.glLightfv(GL.GL_LIGHT1, GL.GL_DIFFUSE, color, 0);
float position[] = {0f, 0f, -1f, 0f};
gl.glLightfv(GL.GL_LIGHT1, GL.GL_POSITION, position, 0);
gl.glEnable(GL.GL_LIGHT1);
float light_specular[] = {0,0,0, 1};
gl.glLightfv(GL.GL_LIGHT2, GL.GL_SPECULAR, light_specular, 0);
gl.glEnable(GL.GL_LIGHT2);
}

i do not know what falloff is.

my result is a flat surface, no shadows no smoothing, color change if rotation change but it is flat.

what i want:

what i'm getting:

PhiLho

PhiLho

Re: porting processing to jogl: how lights() works?

2 years ago

Maybe looking at http://code.google.com/p/processing/source/browse/trunk/processing/opengl/src/processing/opengl/PGraphicsOpenGL.java can be of some help?

andres

andres

Re: porting processing to jogl: how lights() works?

2 years ago

Taking a look at the A3D renderer in the core of Processing Android might also help, as I reimplemented all the lighting API using OpenGL.

nootropic..

Re: porting processing to jogl: how lights() works?

2 years ago

mayebe something concernings normals?

does processing do normals calculi itselfs?

[edit] ohu yeah, was the mesh normals!

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