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Author Topic: Point cloud rendering  (Read 2302 times)
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mistabell
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« on: July 14, 2010, 09:09:27 AM »

Hey guys!  I just recently started playing around with fractals and joined the forum yesterday.

Over the past week or so I've done a bunch of the mandelbrot / julia variations and other 2d fractals.  Now I'm trying my hand at 3d.

I wrote a script that generates a list of vertex points for the mandelbulb, generated a few million points, then looked up how to render point clouds on Google.  I found 3 or 4 apps that are made for 3d laser scans or CAD that have functions to turn a point cloud into a mesh, but none of them really worked (horribly jagged / weird 3d shapes.)  I think the problem is that the apps assume the data will be from a 3d scanner with only the outer surface of the object, whereas I have a cubic grid with binary points that fill in the object.

Maybe I need to rethink the way I'm rendering it?  Is it possible to only render the outer points of the shape?

Or, does anyone know of an app that will put a sphere at each of my points, such that if a cluster of points are near each other I get a nice round blobby thing?

Here's what the points look like:
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cbuchner1
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« Reply #1 on: July 14, 2010, 06:38:50 PM »

Maybe I need to rethink the way I'm rendering it?  Is it possible to only render the outer points of the shape?

RAYMARCH from the outside towards the object using distance estimation. If you pick a large number of rays randomly intersecting a sphere of radius 2 around the origin, you should be able to get a point cloud similar to what a laser scanner would produce.
« Last Edit: July 14, 2010, 07:16:01 PM by cbuchner1 » Logged
Nahee_Enterprises
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« Reply #2 on: July 28, 2010, 11:39:39 PM »

    Hey guys!  I just recently started playing around with fractals and joined the forum yesterday.
    Over the past week or so I've done a bunch of the mandelbrot / julia variations and
    other 2d fractals.  Now I'm trying my hand at 3d. 

Greetings, and Welcome to this particular Forum !!!    smiley

It appears you are off to a very good start, based upon what you have already posted.  There is always something new to learn, and this Forum has much to offer.  Good luck with it all.
 
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