Smooth shading in openGL

Core Library Questions

butterbr0t

in Core Library Questions • 1 year ago

Hey,
how would I go about a 3d model in my scene that I want to have rendered smoothly? Are there native ways to get something like a phong shader going? I tried to use 3rd party libraries like surfaceLib and GLGraphics for this, but both dont seem to work with Processing 2.04a :(
Cheers

edit: I get this error when trying to work with GLGraphics:

Exception in thread "Animation Thread" java.lang.NoClassDefFoundError: processing/opengl/PGraphicsOpenGL$ImageCache
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2404)
    at java.lang.Class.getConstructor0(Class.java:2714)
    at java.lang.Class.getConstructor(Class.java:1674)
    at processing.core.PApplet.makeGraphics(Unknown Source)
    at processing.core.PApplet.size(Unknown Source)
    at processing.core.PApplet.size(Unknown Source)
    at sketch_dec06a.setup(sketch_dec06a.java:58)
    at processing.core.PApplet.handleDraw(Unknown Source)
    at processing.core.PApplet.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.ClassNotFoundException: processing.opengl.PGraphicsOpenGL$ImageCache
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    ... 11 more

Replies(4)

jbum

Re: Smooth shading in openGL

1 year ago

Processing 2 (which is still in beta) is absorbing much of GLGraphics, which is why the old GLGraphics doesn't work. Your options are

1) Use Processing 1.x with GLGraphics (or perhaps surfacelib).

2) Figure out how to use the parts of Processing 2 that now make use of GLGraphics. Can't help you here, as I'm still using Processing 1 (and waiting for 2.x to get more stable).

Here's a recent thread in which someone figured out how to do line smoothing using 1.x.

butterbr0t

Re: Smooth shading in openGL

1 year ago

Thanks, I appreciate your help. So it is 1.51 then. I admit I am stuck right now, as I still dont manage to get many of the GLGraphics and surfaceLibs examples to run and cant find any processing related openGL commands on this. Just to illustrate what I want to do please see this image :

So left is roughly what I got (screenshots are from 3ds Max) and right is what I want. So if anybody knows an easy way to achieve this shading effect, be it with OPENGL, GLGraphics, surfaceLib or whatever, please point me in the right direction :)
Cheers