cutting a square hole in a cylinder top/cap

[chow choppe]

hi guys

 

i am trying to make a square niche recess in a cylinder cap using edit poly

however m not able to make it properly.

can anyone please help me how to do it.

Doing it vice versa is easy( making circularl hile in a square).

 

Thanks

[Stephen Thomas]

I'm sure there are probably many ways to do this. I did it by first insetting your top polygon, then select the vertices that will make up the edges of your square in turn and use the make planar x and y buttons in your edit poly modifier to straighten them. Go around the square repeating this. You can then scale your square to suit if necessary and extrude.

[chow choppe]

I'm sure there are probably many ways to do this. I did it by first insetting your top polygon, then select the vertices that will make up the edges of your square in turn and use the make planar x and y buttons in your edit poly modifier to straighten them. Go around the square repeating this. You can then scale your square to suit if necessary and extrude.

 

 

thanks stefan for the graphic.

I am able to achieve what u said

but i am facing problem with sharp corners. getting them to be too rounded

i am confused hoe to put hard edges to make those square corners sharp

 

thanks

[Stephen Thomas]

I'm not sure what you mean, can you post a screenshot?

[chow choppe]

here it is

 

[Stephen Thomas]

Ah, I see. You need to chamfer your edges first or add additional edge loops to define how tight you want your corner radii to be. Turbosmooth will always by its nature round the corners, it's just a question of how much. This isn't a bad thing though and means your render will have nicer reflections and pick up highlights on the edges which are more realistic. See attached.

Edit: sorry, I see you already used this method! Don't worry about the vertices being close together after the turbosmooth is applied, this shouldn't be an issue.

Edited May 19, 2010 by stef.thomas

[chow choppe]

stefan thats exactly what i did, but do you see the pinching out of the exterior most vertices along those new edges

i had marked that vertex in my image also. do i need to move them manually to make the outer profile a perfect circle again?

[Stephen Thomas]

I think that's because you used connect and then moved the vertices prior to applying the turbosmooth. If you use chamfer instead then you shouldn't have that problem. Hope that helps!

Edited May 19, 2010 by stef.thomas

[chow choppe]

no i chamfered those corner loop of edges before the turbosmooth

see

[Stephen Thomas]

Ok, I see now you're correct. In that case you have to just chamfer the edges inside the recess and not continue the edge loop to the outside of the circle. You can use target weld to clean up your quads before applying turbosmooth.

[chow choppe]

thanks stefen

finally got what i was trying to make. still have trouble cleaning up those polygons but i think i am almost there

Thanks a lot. will trouble you with more queries soon :-) as i am working on a classical building modelling.

Thanks

[Stephen Thomas]

No problem. I'm learning here too!