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How this polysurface is made?


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Hey guys, 

  I am curious how this polysurface is made (a circle on a circle), basically I am trying to create this pattern on BB-8.

26060562_.PNG.7a7081143def77da4be827954bcdb33f.PNG

this is what I've got now, and I think I need to do some cuts in order to get the circle. 

cutmaybe.PNG.db1474abf3e6ac50ec03467747c1c656.PNG

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  • Solution

There´s a more ways how to do it. You could project mesh on surface and with modeling tools merge together or project spline and with snapping and modeling tools create hole.

Also could be used boolean way which I´ll describe in details...

 

First of all, your blueprint is planar and not real view to model from the top. So, hole to surface MUST be perpendicular to surface, not to top view

 

1.png.5bdeace9c42151ae2eea613582602de0.png

2.png.7b72ece50ddaef3ae01bc5fd773a1c15.png

 

For correct orientation of cylinder is used snapping to vertices and constraint in clamp mode to sufrace

 

3.png.f26f8a9e2a12184afc160a5a221fdd43.png

 

When work with boole object in c4d, the best way is using just portion of "cutted" object because if mesh contain some n-gons or bad mesh, it could produce bad results in areas where we not work. So, in polygon mode just select mesh in even distance around cylinder (one or two polyloops around), create copy of object and delete inverted polygons and use Boolean operation for creating hole...

 

4.png.83a8adc033f9c5107a1d648f07ef560b.png

5.png.b22828bb70bae5d1320ffe1084ab4857.png

 

Here is main rule to use the same rotation segments count of cylinder as is loop of points near hole. So, if point count aroun hole is 16, the same count rotation segments must be set for cylinder.

 

If is performed boolean operation, there will be created unwated points/edges in place where not needed what must be solved by modeling tools (live selection and weld tool in point mode) In this case should be nicely visible with n-gon lines posible solutions.

 

6.png.9fa9515efe6fe023f1d34f63cc65eb45.png

 

After cleaning mesh it looks like this

 

7.png.4fc2927a8c3daed3c9b425fe35fa2046.png

 

After optimizing all points and removing n-gons you have nice cutted mesh which you need merge back to source mesh (where you delete this part of mesh which will be replaced by cutted mesh)

 

8.png.4d58ce6dcb6343157c313a1b15accd3d.png

 

When you select both meshes and use command Connect object and Delete, you will get nice connected single mesh with perfect hole

 

9.png.192ca7df5fc65ac9c5dfdb3999117caf.png

 

If you check it with SDS, you could see nicely optimized mesh

 

10.png.a95d7851ccc2338bacf637b7701dd789.png

 

BTW, when you create hole this way, always use cylinder a little bit bigger than hole you need since for SDS/hardsurface you need to create additional edge loop for sharping edges. So with Close polygon Hole close hole and with inner extrude command extrude inner for a small value and delete n-gon

 

11.png.9f3372196aa9d7d40869c0892d6b3f2e.png 

 

 

Then select inner edge loop and drag by normal a bit to outside of object (to keep curvature of surface) and you´re done...

 

12.png.ac00bcc9875d2094b86e663d6e3a21e6.png

13.png.2aa76c0e831ab493988c70ba99afe973.png

 

That´s all 🙂

 

scene file:

 

hole in surface boolean way.zip

 

 

 

 

 

 

 

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On 8/8/2021 at 1:23 AM, bezo said:

There´s a more ways how to do it. You could project mesh on surface and with modeling tools merge together or project spline and with snapping and modeling tools create hole.

Also could be used boolean way which I´ll describe in details...

 

First of all, your blueprint is planar and not real view to model from the top. So, hole to surface MUST be perpendicular to surface, not to top view

 

1.png.5bdeace9c42151ae2eea613582602de0.png

2.png.7b72ece50ddaef3ae01bc5fd773a1c15.png

 

For correct orientation of cylinder is used snapping to vertices and constraint in clamp mode to sufrace

 

3.png.f26f8a9e2a12184afc160a5a221fdd43.png

 

When work with boole object in c4d, the best way is using just portion of "cutted" object because if mesh contain some n-gons or bad mesh, it could produce bad results in areas where we not work. So, in polygon mode just select mesh in even distance around cylinder (one or two polyloops around), create copy of object and delete inverted polygons and use Boolean operation for creating hole...

 

4.png.83a8adc033f9c5107a1d648f07ef560b.png

5.png.b22828bb70bae5d1320ffe1084ab4857.png

 

Here is main rule to use the same rotation segments count of cylinder as is loop of points near hole. So, if point count aroun hole is 16, the same count rotation segments must be set for cylinder.

 

If is performed boolean operation, there will be created unwated points/edges in place where not needed what must be solved by modeling tools (live selection and weld tool in point mode) In this case should be nicely visible with n-gon lines posible solutions.

 

6.png.9fa9515efe6fe023f1d34f63cc65eb45.png

 

After cleaning mesh it looks like this

 

7.png.4fc2927a8c3daed3c9b425fe35fa2046.png

 

After optimizing all points and removing n-gons you have nice cutted mesh which you need merge back to source mesh (where you delete this part of mesh which will be replaced by cutted mesh)

 

8.png.4d58ce6dcb6343157c313a1b15accd3d.png

 

When you select both meshes and use command Connect object and Delete, you will get nice connected single mesh with perfect hole

 

9.png.192ca7df5fc65ac9c5dfdb3999117caf.png

 

If you check it with SDS, you could see nicely optimized mesh

 

10.png.a95d7851ccc2338bacf637b7701dd789.png

 

BTW, when you create hole this way, always use cylinder a little bit bigger than hole you need since for SDS/hardsurface you need to create additional edge loop for sharping edges. So with Close polygon Hole close hole and with inner extrude command extrude inner for a small value and delete n-gon

 

11.png.9f3372196aa9d7d40869c0892d6b3f2e.png 

 

 

Then select inner edge loop and drag by normal a bit to outside of object (to keep curvature of surface) and you´re done...

 

12.png.ac00bcc9875d2094b86e663d6e3a21e6.png

13.png.2aa76c0e831ab493988c70ba99afe973.png

 

That´s all 🙂

 

scene file:

 

hole in surface boolean way.zip 134.94 kB · 1 download

 

 

 

 

 

 

 

This is super helpful, sorry I wasn't with my machine for few days and missed this solution. Thanks a million Bezo.

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