Why SideFX have chosen XY Plane to face in Negative Z?

Forums Houdini Lounge Why SideFX have chosen XY Plane to face in Negative Z?

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kodbitz: Member; 8 posts; Joined: Sept. 2019; Offline

Sept. 30, 2019 8 a.m.

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.

Attachments:
why-z.jpg (648.9 KB)


roxo: Member; 13 posts; Joined: Feb. 2006; Offline

Sept. 30, 2019 8:16 a.m.

Good question so far


BabaJ: Member; 2038 posts; Joined: Sept. 2015; Offline

Sept. 30, 2019 9:45 a.m.

I believe it's for backward compatibility.


anon_user_89151269: Member; 1755 posts; Joined: March 2014; Offline

Sept. 30, 2019 12:10 p.m.

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…


BabaJ: Member; 2038 posts; Joined: Sept. 2015; Offline

Sept. 30, 2019 1:43 p.m.

Uhm…sry?…that was meant as a joke;

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


edschiffer: Member; 11 posts; Joined: Sept. 2016; Offline

Oct. 2, 2019 10:23 a.m.

I never understood this as well.


asm: Member; 31 posts; Joined: May 2018; Offline

Oct. 2, 2019 5:21 p.m.

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

Edited by asm - Oct. 2, 2019 17:21:49


anon_user_89151269: Member; 1755 posts; Joined: March 2014; Offline

Oct. 8, 2019 noon

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.


furrycghamster: Member; 1 posts; Joined: Oct. 2019; Offline

Oct. 11, 2019 11:19 a.m.

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!


edward: Member; 7714 posts; Joined: July 2005; Offline

Dec. 30, 2019 11:11 a.m.

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.

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