[Bf-funboard] RE: 'The selected vertices form a concave quad' must die!

[J L]

Hi,

I agree.

That darned message is absolutely wretched, espeically when you can see that 
a quad can nicely be made from 4 verts. Often, it just involves adding 1 
edge to make this work well. When modelling, I DON'T CARE if it's concave or 
convex, all that matters is that I want a quad.

Checking the code, this is what seems to be happening:
6 checks are performed to see what order the verts should be in. They seemed 
to be based on determining whether the diagonals of the quad defined by the 
4 points in that order intersect. Is there really no other way to do this? 
Or are the any other tests that can be done to figure it out for the 
remaining cases?

And while we're at this, could some other tweaks around this area be done?
i.e. if you have 4 verts selected, and those 4 verts already form 2 
triangles, why not convert those triangles to a quad?

Regards,
Aligorith

>From: "Matt Ebb" <matt at mke3.net>
>Reply-To: bf-funboard at projects.blender.org
>To: Bf-funboard at projects.blender.org
>Subject: [Bf-funboard] 'The selected vertices form a concave quad' must 
>die!
>Date: Tue, 24 Apr 2007 13:20:29 +1000
>Hi,
>
>Would anyone in charge of mesh editing like to do me (and presumably
>many others) a big favour and get rid of the infuriating "The selected
>vertices form a concave quad" check and error message when using F to
>make a face from 4 vertices? I've been doing lots of modelling today
>and it's getting so incredibly annoying, especially when modelling
>things like ears with lots of sharp angles in topology.
>
>It's pointless, and feels like Blender is arrogantly saying "tut tut,
>you shouldn't be doing that, naughty user!" when I'm quite certain
>that I do want to make a quad in that shape, even if it's going to be
>tweaked after. Regardless of what reasons there may have originally
>been to go to the trouble of preventing this, checking in the F tool
>isn't going to prevent anything, since you can (as I often do) just
>smooth the points to satisfy the grumpy tool, then manually move the
>verts back where you originally wanted them.
>
>And even considering what issues there may be with concave faces (I
>guess it's to prevent weird triangulation come render time), it's all
>made irrelevant anyway when you're using subdivision surfaces, and the
>concavity of the mesh cage's polys are irrelevant to that of the final
>subdivided faces.
>
>Please someone help save some of my hair, before its all pulled out!
>
>cheers
>
>Matt
>

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