Physics Material Settings test

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Verify custom Physics Material Settings are disabled in unsupported regions

  • eg. Morris on ADITI (12-08-2010)
  • eg. they all default to 0.000

consistency testing

  • attempt to measure the min and max physical settings for a default box. how?
  • Verify you are unable to change the settings to out of bounds values:
    • Gravity [-1, 28]
    • Friction [0, 255]
    • Density [1 to 22587]
    • Restitution [0, 1]
  • Gravity == how fast it falls/how much downward force is applied to it.
    • Make 2 physical boxes, set the gravity of one box to 10.
    • Drop both boxes at the same time
    • Verify the box with more gravity falls faster.
  • Friction == sliding stickiness
    • Make 2 physical boxes, set the friction of one box to 255.
    • Drag each box on the ground with the Drag tool (ctrl-2)
    • Verify the box with more friction rolls on the ground while the other tends to slide.
  • Density should affect collisions with a denser object being affected less in a collision with a less dense object, all else being equal.
    • mass = density * volume. That volume is the true volume of the shape.
    • Measure the mass of an object by adding this script and touching the object: default{touch_start(integer total_number){llSay(0, "mass = "+(string)llGetMass());}}
    • Double the density of the object.
    • Measure the mass again an Verify it has doubled.
    • Make 2 physical spheres, set the Density of one sphere to 22587.
    • Make the spheres collide using the Drag tool (ctrl-2)
    • Verify the sphere with less Density bounces off the sphere with the greater Density.
  • higher Restitution is bouncier. ...though setting it to 0 is not recommended as you'll likely get penetrations
    • Make a 5x5x0.5m box "platform"
    • Make 2 physical spheres. Set the Restitution of one sphere to 1.0
    • Drop both spheres onto the platform
    • Verify the sphere with higher Restitution bounces higher.
  • Verify the material presets (wood, glass, etc.) load the correct Physics Material Settings
    • Stone
      • Friction = 0.8
      • Restitution = 0.4
    • Metal
      • Friction = 0.3
      • Restitution = 0.4
    • Glass
      • Friction = 0.2
      • Restitution = 0.7
    • Wood
      • Friction = 0.6
      • Restitution = 0.5
    • Flesh
      • Friction = 0.9
      • Restitution = 0.3
    • Plastic
      • Friction = 0.4
      • Restitution = 0.7
    • Rubber
      • Friction = 0.9
      • Restitution = 0.9
  • Test the Override material option (when that UI is finished)

exploit testing

  • Play with restitution = 0
  • Can individual prims in a linked set have different Physics settings? Yes.
  • Attempt to cause exploit by dragging a mesh asset onto a mesh object.
  • Attempt to cause exploit by dropping an attached mesh on the ground.
  • What else?

griefing concerns

  • Any ideas?