On the edge of my model I'm trying to eliminate the tri face it's making. If I do a knife cut vertical, it'll make a quad, but if I go horizontal it'll make a tri face. When I add the subdivision modifier, it seems like a much cleaner topology. Is there a solution when it comes to avoid the mesh from making a tris?
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1$\begingroup$ I don't have a answer for that specific case, but the whole Topology Guides are a must-read and should give you some directions : topologyguides.com/archive $\endgroup$– thibsertCommented Oct 22, 2020 at 13:54
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1$\begingroup$ Suggest add another support edge on the side (which is needed for the subsurf anyway) and I think the problem might goes away automatically... see Jachym's answer. $\endgroup$– brockmannCommented Oct 22, 2020 at 14:35
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You don't need the knife cut at all :).
Just inset the corner slightly, it'll move the ugly quad out of the way.
The corner is now smooth, and you can add more loopcuts to make it sharper.
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2$\begingroup$ A link to eg. topologyguides.com or graphics.pixar.com/opensubdiv/docs/mod_notes.html might be useful. $\endgroup$ Commented Oct 22, 2020 at 14:42
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$\begingroup$ Oh, that pixar page is a new one for me, thanks :). $\endgroup$ Commented Oct 22, 2020 at 14:45