3dsM: cutting perfect holes into a sphere?

waxpants · 26-03-2004, 06:43 PM

What is the best way to do this?

I've using cylinders with boolean to cut nice circular holes into a sphere.

But when I do this the mesh around these new holes in the sphere gets a little lumpy and I no longer have a nice smooth sphere.

I think the reason this happens is due to the difference in complexity between the sphere and the cylinder. Where the cylinder has 28 sides but it's cutting through maybe 4 polygons on the surface of the sphere.

Is that the reason?? Do I need to make an insanely complex sphere to match or is there an easier method?

SpecterCorp · 27-03-2004, 04:26 AM

someone here posted this tutorial. Its been a huge help to me and I think it applies here also:

http://members.lycos.co.uk/ross3d/tut/tutorial_01.htm

waxpants · 27-03-2004, 05:53 AM

Thanks SpectreCorp That tutorial is definately something I'll chew over in the future.

In this case though it's not going to help me much as it deals with marrying two flat surfaces.

It becomes much more bothersome when trying to work on a curved surface like the surface of a sphere.

waxpants · 27-03-2004, 11:51 AM

After more messing about, it turns out that the tutorial you linked for me is usefull for what I'm trying to do.

As long as my boolean stays inside of one polygon I don't get any screw ups in my mesh.

So thanks again SpectreCorp.

RodrigoRosa · 27-03-2004, 01:53 PM

the picture speaks by itself

cheers

PS: i used a box to do the boolean.... and i have used meshsmooth of 2 and in the render 3 (but this configuration is up to you)

RodrigoRosa · 27-03-2004, 01:55 PM

and another... dunno if this is the best but it works.....

waxpants · 30-03-2004, 10:00 AM

Thanks Rodrigo, I used your technique and the tip from one of the sticky topics about making extra edge loops to stop mesh smooth from rounding out corners too much and got good results.

Here it is..

BUT

What if I want bigger holes?
I can use a larger object to across multiple polygons with a boolean.

If I only do one boolean on an object it turns out alright like on the left of the picture below. It doesn't draw in the new edges (even though they must be there) and the surface of the sphere stays nice and smooth.

But if I use more than one boolean, the edges are now drawn in and the surface of the sphere starts to break up.

How can I fix that?

waxpants · 30-03-2004, 10:48 AM

Bah silly me. I've worked it out now.

Still using square holes. I've learned a huge lesson about screwing around with the polys and removing edges and cutting new ones ect.

Big steps today

Thanks again to Rodrigo for starting me off on this road.

Bracer · 30-03-2004, 05:30 PM

That Tutorial Is Fantastic Man !

It Allow One To Create Cool Fillet Effect Without Resorting To Plugins Like NPowerSoft's Power Solid And Stuff.

Though Initial Planing Is Needed But Then Again Whats New !?

26-03-2004, 06:43 PM	#1
waxpants Registered User Join Date: Mar 2004 Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts	3dsM: cutting perfect holes into a sphere? What is the best way to do this? I've using cylinders with boolean to cut nice circular holes into a sphere. But when I do this the mesh around these new holes in the sphere gets a little lumpy and I no longer have a nice smooth sphere. I think the reason this happens is due to the difference in complexity between the sphere and the cylinder. Where the cylinder has 28 sides but it's cutting through maybe 4 polygons on the surface of the sphere. Is that the reason?? Do I need to make an insanely complex sphere to match or is there an easier method?

27-03-2004, 01:53 PM	#5
RodrigoRosa WHAT?!?! Join Date: Jun 2003 Location: Brasilia, Brazil Posts: 711 Thanks: 0 Thanked 0 Times in 0 Posts	the picture speaks by itself cheers PS: i used a box to do the boolean.... and i have used meshsmooth of 2 and in the render 3 (but this configuration is up to you) __________________ "if the education is expensive, experience the ignorance." "Everything that has a beginning has an end" - The Matrix Revolutions Last edited by RodrigoRosa; 27-03-2004 at 01:58 PM..

27-03-2004, 01:55 PM	#6
RodrigoRosa WHAT?!?! Join Date: Jun 2003 Location: Brasilia, Brazil Posts: 711 Thanks: 0 Thanked 0 Times in 0 Posts	and another... dunno if this is the best but it works..... __________________ "if the education is expensive, experience the ignorance." "Everything that has a beginning has an end" - The Matrix Revolutions Last edited by RodrigoRosa; 27-03-2004 at 02:00 PM..

30-03-2004, 05:30 PM	#9
Bracer Registered User Join Date: Dec 2002 Posts: 1,185 Thanks: 0 Thanked 0 Times in 0 Posts Awards Showcase Total Awards: 1	That Tutorial Is Fantastic Man ! It Allow One To Create Cool Fillet Effect Without Resorting To Plugins Like NPowerSoft's Power Solid And Stuff. Though Initial Planing Is Needed But Then Again Whats New !? __________________ Modeling a 3D Pencil Ironman Helmet Tutorial Project Evangelion Bracercom V2 Mascot

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27-03-2004, 04:26 AM	#2
SpecterCorp Registered User Join Date: Mar 2004 Location: St. Augustine, FL Posts: 50 Thanks: 0 Thanked 0 Times in 0 Posts	someone here posted this tutorial. Its been a huge help to me and I think it applies here also: http://members.lycos.co.uk/ross3d/tut/tutorial_01.htm

27-03-2004, 05:53 AM	#3
waxpants Registered User Join Date: Mar 2004 Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks SpectreCorp That tutorial is definately something I'll chew over in the future. In this case though it's not going to help me much as it deals with marrying two flat surfaces. It becomes much more bothersome when trying to work on a curved surface like the surface of a sphere.

27-03-2004, 11:51 AM	#4
waxpants Registered User Join Date: Mar 2004 Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts	After more messing about, it turns out that the tutorial you linked for me is usefull for what I'm trying to do. As long as my boolean stays inside of one polygon I don't get any screw ups in my mesh. So thanks again SpectreCorp.

30-03-2004, 10:00 AM	#7
waxpants Registered User Join Date: Mar 2004 Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks Rodrigo, I used your technique and the tip from one of the sticky topics about making extra edge loops to stop mesh smooth from rounding out corners too much and got good results. Here it is.. BUT What if I want bigger holes? I can use a larger object to across multiple polygons with a boolean. If I only do one boolean on an object it turns out alright like on the left of the picture below. It doesn't draw in the new edges (even though they must be there) and the surface of the sphere stays nice and smooth. But if I use more than one boolean, the edges are now drawn in and the surface of the sphere starts to break up. How can I fix that?

30-03-2004, 10:48 AM	#8
waxpants Registered User Join Date: Mar 2004 Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts	Bah silly me. I've worked it out now. Still using square holes. I've learned a huge lesson about screwing around with the polys and removing edges and cutting new ones ect. Big steps today Thanks again to Rodrigo for starting me off on this road.

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