gravity and grenade velocity

[tempest]

Much simpler. There are no units, really.

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// fake physics for player ents to create _the_ cube movement (tm)

, for bouncers however

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const float CUBES_PER_METER = 4; // assumes 4 cubes make up 1 meter
const float BOUNCE_MASS = 0.5f; // sane default mass of 0.5 kg
const float GRAVITY = BOUNCE_MASS*9.81f/CUBES_PER_METER/1000.0f;
bounce->vel.z -= GRAVITY*curtime;

Still, most of the physics were just

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invented on the fly and simply tweaked until
// they "felt right", and have no basis in reality.

Offtopic request to devs: please agree on whether you use spaces or tabs in the source code.