Processing 1.0 - Processing Discourse - nasty lines inside shapes in 3d scene

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nasty lines inside shapes in 3d scene (Read 1874 times)

cuca

nasty lines inside shapes in 3d scene
Jan 8^th, 2010, 4:10am

hello folks and happy new year to all!
I 'll appreciate much your help to resolve a little nasty problem with my 3D application.
When i use ellipse function or rect etcc with P3D render in my own PGraphics object there are nasty black lines inside the shape and i don't know how to eliminate them using this render.
Using OPENGL the nasty lines inside the ellipses disappear but i have another problem.
They doesn't look like really ellipse when they are far from the camera in 3D scene, they look like hexagons..
some one can help me??

Thanks a ton and sorry for my bad english

jeffg Senior Member Offline Posts: 472	Re: nasty lines inside shapes in 3d scene Reply #1 - Jan 8^th, 2010, 5:55am Could you post a small code example? It would go a long way toward understanding the issue. Thanks..

Cedric YaBB Moderator Offline Posts: 1838	Re: nasty lines inside shapes in 3d scene Reply #2 - Jan 8^th, 2010, 6:18am it probably looks like this : http://dl.dropbox.com/u/1152794/circleProblem.jpg that happens when using smooth in P3D. Cant remember if there was a solution beside removing smooth...
	« Last Edit: Jan 8^th, 2010, 7:42am by Cedric » twitter.com/CedricKiefer

jeffg Senior Member Offline Posts: 472	Re: nasty lines inside shapes in 3d scene Reply #3 - Jan 8^th, 2010, 6:24am Could probably use noStroke() or set the stroke color to black. I'm not seeing the issue if I do something like this.. Code: void setup(){ size(500,300,P3D); smooth(); } void draw() { fill(0); ellipse(156, 146, 155, 155); }

Cedric YaBB Moderator Offline Posts: 1838	Re: nasty lines inside shapes in 3d scene Reply #4 - Jan 8^th, 2010, 7:12am try to add a white background to draw, then you see it
	twitter.com/CedricKiefer

Chrisir Full Member Offline Posts: 207 Germany	Re: nasty lines inside shapes in 3d scene Reply #5 - Jan 8^th, 2010, 7:31am use noSmooth();

Cedric YaBB Moderator Offline Posts: 1838	Re: nasty lines inside shapes in 3d scene Reply #6 - Jan 8^th, 2010, 7:42am we figured that out, the question is, is there a better solution where you can still use smooth
	twitter.com/CedricKiefer

John_Doe YaBB Newbies Offline Posts: 18	Re: nasty lines inside shapes in 3d scene Reply #7 - Jan 8^th, 2010, 7:58am One solution is to draw the circle with noStroke() and noSmooth() then draw it again with stroke(), noFill() and smooth(). That way it will look smooth without the lines inside. The downside is that you have to draw it twice.

Quark

Re: nasty lines inside shapes in 3d scene
Reply #8 - Jan 8^th, 2010, 8:57am

There is a bug in the P3D rending mode that causes lines and shapes that are behind the viewpoint to be displayed as if in front. This can cause very distorted images. See bug report
http://dev.processing.org/bugs/show_bug.cgi?id=1393

P3D works fine if everything to be drawn is in front of the view point but for anything else OPENGL is the solution.
Wink

Cedric YaBB Moderator Offline Posts: 1838	Re: nasty lines inside shapes in 3d scene Reply #9 - Jan 8^th, 2010, 9:12am thats not the same problem i guess
	twitter.com/CedricKiefer

Quark

Re: nasty lines inside shapes in 3d scene
Reply #10 - Jan 8^th, 2010, 10:58am

On second thought I think you are right in that it is a different problem. But when cuca said
Quote:

Using OPENGL the nasty lines inside the ellipses disappear

made me think of it and it is probably worth knowing.

I spent a couple of days on the Shapes3D library trying to sort out shape picking before I discovered the bug was not actually in my code!
Sad

cuca YaBB Newbies Offline Posts: 2	Re: nasty lines inside shapes in 3d scene Reply #11 - Jan 11^th, 2010, 7:52am thanks to all guys for your interest. The problem is exactly what cedric show us on that link. i'm developing an audio video with OPENGL render but i'd like to produce some shot image of the application also,that's the reason i would use P3D in PGraphics object to obtain high quality image. good job to all

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