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Re: Missign references - floating and unattached red coincident icon
The red icon has lost reference. it stays in view as indicator of problem.
Look at feature tree and see where the warnings and errors start. The previous feature would be a likely suspect. First option is undo. If you notice a problem that may be very time consuming to fix. There is an option to go back via the version and history tree to before this happened. Select make a version. Select the versions one at a time until you arrive before the the error then select main. Right click on good version and select restore to main.
In this sample a line was deleted in sketch 1 that caused a cascade through everything else. Step one is undo. If not noticed for some time then use longhand version of undo via history tree.
Re: Sometime my curved sketches extrude straight
Thank you so much. I was hoping I just needed to adjust the settings but didn't know exactly what i was looking for.
Re: Is there a usage standard for CALLOUTS that have boundary geometry?
It is my understanding/experience that drawing standards/practices are an organic beast which is ultimately set by the organization in which you are creating a drawing for. I just want to use callout symbols according to general accepted usage.
Since OS has baked-in a set of callout/flag note styles I was hoping to find an simple "generally accepted" explanation/definition for each type on the web from a trusted source.
The problem with standards organizations is they keep their information behind a paywall, which runs counter to their mission statement.

Re: How to make a cube?
I'd start with our free courses:
Just use one of the rectangle tools, constrain the sides equal and to length D, then extrude to depth D.

Re: Boolean Boss Battle
Have your main object. Then create plane and sketch for boss. Extrude boss to main object. Apply fillet to boss joint. Shell tool to hollow it out.

Re: Boolean Boss Battle
If possible, it would be better to modify the outside shape as a solid and use the shell tool.

Re: Optics: Custom Feature
Used this today to get a feel for how realistic a more compact TIR would be (using the tip of hiding the "hits" to show the "density"):
It's nice to be able to get a set of rays coming out from the face of the "LED" instead of a single point (like the Ray Tracer FS did) to take into account the size of the source.
Detail of the rays used (face is the size of the primary LED lens):
Re: Best way to place a construction line from offset of circle centre to circumference?
There are tons of ways to do this… But you don't need to overlay anything.
One way is to just drawn the slot centerline anywhere inside the circle, set it coincident with the center point and add dimensions from the end to the outer circle and origin.
You could also create 3 lines segments and set them coincident