topic Re: Can I merge these two surfaces? in Fusion Support Forum

Can I merge these two surfaces?

powell.richard — Thu, 29 May 2025 01:19:27 GMT

Hi everyone. I'm very new to Fusion 360. I imported this square pyramid shape that has the top cut off and I simply want to be able to sketch on each of the 4 sides of the pyramid. But the 4 sides are made of 2 triangles each. I am having trouble merging the 2 triangles on each side. Is that not possible? If not, is there a way to remesh? I want to be able to extrude sketches on each of the 4 sides but the triangles prevent that. I guess the other idea is I could create a pyramid in Fusion 360 but I don't know how to do that yet nor do I know how to lop off the top of the pyramid after making it.

thanks for any help or advice.

Re: Can I merge these two surfaces?

davebYYPCU — Thu, 29 May 2025 02:11:24 GMT

Sketch a 25 mm square

Extrude command, select the square shading in the sketch,

set height of the extrusion, (5.8mm) then

set a taper angle (-36 deg) in the dialogue, to change the box to a pyramid.

Sketching on a side face will occur.

Might help…..

Re: Can I merge these two surfaces?

powell.richard — Thu, 29 May 2025 12:18:34 GMT

Yes that should help thanks. I think the problem I had is I created the pyramid in Zbrush which creates triangles on mesh surfaces instead of single flat planes. I will try your steps to make a new "cut off" pyramid thanks.

Re: Can I merge these two surfaces?

TheCADWhisperer — Thu, 29 May 2025 12:43:41 GMT

@powell.richard

I will demonstrate several techniques.

Check back as I add them to this thread.

One thing I noticed is that the dimensions of your original do not make logical sense.

Re: Can I merge these two surfaces?

powell.richard — Fri, 30 May 2025 00:42:10 GMT

Thank you. I assume the overall idea is I need to remember to make the basic shapes in Fusion first if I want to have clean surfaces. I imported the pyramid before that I made in a sculpting program which was now clearly a bad idea. Thank you for these 3 different ways. I will practice making some now.