#2 Get rid of default sketch on Sketch Editor

[Sean Morrison]

When you create a sketch either via the menus or via the make
command, it ends up creating a sketch shape with existing curves
and shapes. While this makes some sense for the make command
to create something, it doesn't make as much sense for the create
menu that drops you into the Sketch Editor as the user just ends up
needing to delete everything.

[daniel_hemma]

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Why get rid of it???

Why not make it work.

I think it can be quite useful to be able create a 2d sketch.
I suggest adding some more functions.

e.g Clear, clear all, a measurement tool. 2d primitives(2d
version of the 3d primitives)

Then you can use the sketch tool to create a very complex
shape/object.

Maybe even have a 2d import tool that allow the user to
import a 2d drawing in e.g. dxf-format.

The important thing is that the user need to be able to make
it a 3d object later on(if needed).
This can be done with a extrude function. The extrude
function could be the final step in creating the shape/object.
If the user still want the obejct to be in 2d then the user just
set the thickness to "0"

[Sean Morrison]

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Heh, I think you misunderstood the request change. When you create a
sketch either via the menu or via the make command, it creates a
"default" sketch consisting of a square with one edge rounded and a hole
in the middle. This is the default sketch in question. If you want to
actually create and use a sketch, it is unlikely that you wanted the same
default sketch that was made for you so you end up deleting all of it
before you can begin.

The entire sketch primitive type is NOT going to be removed. It's just
now you start with a clean slate. As for the other features you
mentioned, there is already a dxf importer that preserves such drawings
if they were used in a 3D model (more work is probably needed on
purely 2D imports).

BRL-CAD already has an extrusion primitive (called extrude) that is used
to turn the sketch objects into 3D solids that you can then utilize in CSG
operations, raytrace it, etc. If the user just wants it in 2D, they have the
sketch primitive that way already.

[daniel_hemma]

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Aaa ok,
I agree, the default sketch is not need

On the other hand if you use extrude from the menu.
Then the default object/drawing in the sketch tool is extruded
even after you have deleted it.

So I would assume the sketch tool and the extrude tool (from
the menu) needs some improvements

[Sean Morrison]

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Sounds like it's either a bug or misunderstanding if it's extruding the
default shape after you've deleted it. Might not have applied the
changes.. I'll try to remember to take a look at it, but if it's even
unexpected behavior, I'd suggest filing either a bug report or feature
change request.

Latest CVS no longer has the default sketch shape getting generated
now.