View Full Version : Urgent!!! please help me out on this!! (modelling related)

04-03-2007, 11:51 PM
Hi guys, i'm new around here and i have a very basic understanding of modelling in lightwave, anyway i have been doing some modelling and i'm having sometrouble of creasing the edges of my model, i took the image and show you guys of what i meant, here is the link " http://img136.imageshack.us/my.php?image=edgelg1.jpg "

After you guys have a look at that, do you know anyway or tricks or ways that i can apply to crease the edges and yet have a smooth surfaces? i have tried "edge bevel", "smooth shift", and 'bandsaw" and nothing seems to give me what i want, is that a 'partial crease or full crease' function like maya in lightwave? cause i'm really stuck, please help me out guys and explain step by step, my assignment is due in a couple of days! thanks!

04-04-2007, 12:17 AM
To give a sharp edge to a sub patch object, the edges must be closer together. This usually can be accomplished with bandsaw, assuming the polys make a full loop. Bandsaw stops if it finds the end of the loop.
When using bandsaw, use the numerical panel, (keyboard shortcut n) This will let you move the new segments to the far edges allowing a tighter edge.

04-04-2007, 01:10 AM
Thanks silkrooster you are a legend, thanks!

if you don't mind me asking, but can u help me with this problems too?

problem 1, i took a snap shot to show you guys ( http://img300.imageshack.us/my.php?image=facebp7.jpg )

I want a slight round bump on my surface but when i turned it into a Sub-d surface i got a very sharp line around the bump connecting to the surface, and i don't want that i want a smooth joint, i have tried "bevel", 'extruding', and extending the face, but all of them gave me the same result. please help

problem 2, here is a snap shot of my problem ( http://img300.imageshack.us/my.php?image=lineex8.jpg )

After turning my poly-model into a subd model, i got this sharp line near the edge, how do i get my surface to look smooth ? thanks!!! :jam:

04-04-2007, 03:28 AM
I think the both problems may be identacle. its hard to tell with out seeing the wireframe, but I beleive you have some n-gons. Sub patches must be 3 or 4 point polys only(previous to version 9).
If you have an n-gon, that poly can look seperated from the rest of the polys.
For your fender 1 poly on one side has 3 points, the poly above it, looks like it is connected to only 2 of the points, don't skip any points when connecting them together, both polys must have a common shared edge to become one with each other.

04-04-2007, 06:12 AM
I don't have any n-gon , all of the faces have 4 points but foir some strange reason, when i convert it into subd, i always get a sharp line where the 2 surfaces connected, anyone got any ideas on how to fix this? thanks..

here is a new snapshot that i took to show the wireframe and all the other details. ( http://img73.imageshack.us/my.php?image=cageee2.jpg )

04-04-2007, 08:21 AM
I modeled another part of the object and yet i'm still running into the same problem, here is another snapshot with clearer details of what i meant, ( http://img161.imageshack.us/my.php?image=surfaceyd4.jpg )

04-04-2007, 09:11 AM
Lightwave subpatches can do this on certain verts particularly when more than 4 edges are attached, chances are they won't render like this though, it's mainly an openGL problem. If you have LW9 try using Catmull-Clark SDS which doesn't suffer from this drawing error.

04-04-2007, 09:19 AM
thanks baz c, and what is Catmull-Clark SDS?

04-04-2007, 09:11 PM
thanks baz c, and what is Catmull-Clark SDS?

Catmull-Clark is another mathematical approach to subdivision surfaces (SDS). Not only does it allow Ngons it also subdivides the surface differently than the standard subpatch mode.

This smooths out most of the pinching you see in subpatch around 5 poly points. However, subpatch modeling is about controlling the flow of your polys for a predictable smooth shape. Therefore most likely if you have pinching on a 5 poly point it is also going to give you a problem in adjustting the shape at that part of the mesh and you will always be trying to adjust it to no avail.

The only answer is to reflow the mesh to move that to another location where it does not cause this problem that will be unavoidable even in CC.

You can get Catmull Clark by selecting it from the subpach dropdown.

Also you'll see the other thread regarding other tips for SDS modeling.