hi all,

I spend last evening and this morning on running tests on gravity and air-resistance, and more. I'll share my findings in this and consecutive posts, interesting stuff ahead. I reran all my original tests with better controlled settings, and I do have to admit that not all my opinions could hold. That's good.

Why are gravity / density and air-resistance important (at least, for me). Because a lot in Cloth Room is about the interaction between the sim routine and 3D meshes, that's virtual world. And most parameters are about cloth interacting with itself or the collision target. That's halfway virtual and real. But density and air resistance do exist since the Cloth Room itself is filled with gravity and atmosphere, which cannot be turned off. These factors not only are the main drivers behind the Cloth Room sim anyway (without gravity no drape!!) but they are (the only?) hard link from Poser into our real world.

So while some of us seek more understanding at the vertex level, I seek my first understanding in this area. That's why.

So I investigated on:

• does Cloth Room gravity really match Earth gravity? Yes it does.
  So you can continue to derive cloth densities from your own clothes, armed with a ruler and the kitchen scale. 
• does Poser handle gravity consistently? NO IT DOES NOT.
  Our pet monster has a Big Gravity Quirk hidden inside. It harms doing animations in a storytelling Poser scene. I don't know why it's there. I guess it's not a bug, but a feature :(
• does ZERO air resistance mean ZERO indeed? Yes it does.
  I was at fault there. I could not reproduce my earlier findings.
• does the sim routine has serious edge artifacts? Yes is has.
  It might hardly effect stills, it might have a mild effect on normal results in animations, but it will definitely trouble bagginsbill in his fundamental queste. 

I did detailed measurements under controlled conditions, and I did renders. Here they come, in separate posts. Sorry for flooding.

- - - - - 

Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though