Why SideFX have chosen default XY Plane for Grid/Circle/Whatever to face in Negative Z?
I came with this question because it does not fit into my logic that calls that default created objects should face up (or have normals be directed) to scene coordinate system.
I wish someone can explain me why I'm wrong..if am I.
Thank you.

Good question so far

I believe it's for backward compatibility.

Backwards compatibility should be present for a version, maximum two. Or we're never going to move forward on some fronts. And there should be an option/preference to opt for said compatibility or to adopt the new stuff, if you're going start a new project. IMO…

Uhm…sry?…that was meant as a joke;

“…Face in the negative Z…” (Backwards) <> Backwards compatibility.

I never understood this as well.

BabaJ
Uhm…sry?…that was meant as a joke;

“…Face in the negative Z…” (Backwards) <> Backwards compatibility.

I read your post and was going to make that joke because I thought you were being serious

BabaJ
Uhm…sry?…that was meant as a joke;

“…Face in the negative Z…” (Backwards) <> Backwards compatibility.

Cool, it flew over my head obviously, but my point still stands, as a general approach.

I recall in programming land that the default glm camera/opengl API the positive z-axis going through the screen towards you, maybe related to that!

furrycghamster
I recall in programming land that the default glm camera/opengl API the positive z-axis going through the screen towards you, maybe related to that!

That is my guess as well. When you put down a Houdini camera, it is facing in the negative z-axis. That is also the default axis when you do “look at” constraints. So by having these “flat” primitives point in the z-axis, this makes it easier to do “look at” constraints with off the bat.