Making a square hole with t-splines (sculpt)

[Anonymous]

I would like to make have a smooth sphere with a perpendicular extrusion. But I can't seem to obtain an angle without deforming the shape of the sphere:

This is in box mode, the extruded hole is the shape I would like to maintain:

Square hole extrusion

This is the smoothed shape:Smooth shape

I tried by using crease but this is what I obtain, the spherical shape is ruined near the holeCurvature by using crease

I would like to know if you have any suggestions on how to make such a geometry in the sculpt environment?

Because from my understanding if I go back to model and make the hole, I will not be able to continue to edit in sculpt mode the sphere with the hole.

Ps: I also tried to add more detail (edge) but the sphere is still deformed in proximity of the hole

[davebYYPCU]

Do you have the cart before the horse? Finish the sphere without the hole, cut the hole in model space, you will not have to come back to Sculpt. Might help.

[Anonymous]

I can't do that because I still need to work on the form after making the hole.

I wanted to know if it's possible to do that kind of shape in the sculpt environment, because I can't seem to make a steep corner on a curved surface, without modifying the shape.

[TrippyLighting]

There is not reason you could not create that trapezoidal shape as a separate shape in the same Form feature.

[Anonymous]

They need to be attached, since after the sculpting I need to convert them to a solid.

[TrippyLighting]

That can be done without them being attached.

If you can share more details about what you are trying to accomplish that would probably be helpful.

[Anonymous]

I would like to model a demi sphere, and at the end add thickness as a parameter (the shape resembles a worker hard hat). I need to have those surfaces (extrusion) perpendicular to the spherical shape. I hope the images attached make it a bit more clear.Box view: desired extruded shape

But this I what obtain and I can't seem to make a flat surface perpendicular to the sphere, without deforming all the adjacent area:

Smooth view

[TrippyLighting]

And why would all that have to be one T-Spline ?

[Anonymous]

Because I would like to be able to take advantage of the polygonal modeling in the sculpt environment (edit form). It allows me to move the position/dimension of the hole (vertices and edges) easily. Since the model is not fixed in dimension/shape it's really important at this stage to be able to adjust it on the fly.

Correct me if i'm wrong, but otherwise to accomplish the above shape I need to do the following: finish the form --> combine the 2 bodies and then stitch the extrusion (box shape) to the sphere, so that I have one surface body?