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mostly time-consistent gravity

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This commit is contained in:
Ben Russell (300178622) 2015-09-25 17:26:16 +12:00
parent eb4e31a182
commit ec715c4ee2
1 changed files with 11 additions and 1 deletions
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12
pkg/base/obj_player.lua
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@ -834,7 +834,8 @@ function new_player(settings)
this.vz = this.vz * alt_a
if this.mode == PLM_NORMAL then
this.vy = (this.vy + 2.0*MODE_GRAVITY*sec_delta) * alt_a
--this.vy = (this.vy + 2.0*MODE_GRAVITY*sec_delta) * alt_a
this.vy = (this.vy + 2.0*MODE_GRAVITY*sec_delta)
else
this.vy = (this.vy + mvy*mmul) * alt_a
end
@ -1135,6 +1136,15 @@ function new_player(settings)
local tx1,ty1,tz1
ox, oy, oz = this.x, this.y, this.z
nx, ny, nz = this.x + this.vx*sec_delta, this.y + this.vy*sec_delta, this.z + this.vz*sec_delta
if this.mode == PLM_NORMAL then
-- mostly correct gravity
-- FIXME: physics is still a bit of a hack
-- FIXME: need to incorporate air friction properly
local alt_a = math.exp(-sec_delta*mvchange*MODE_PSPEED_CONV_BRAKES)
local accel_grav = 2.0*MODE_GRAVITY
ny = ny + accel_grav/2.0*sec_delta*sec_delta
end
local wasgrounded = this.grounded
tx1, ty1, tz1 = this.calc_motion_trace(sec_current, sec_delta, ox, oy, oz, nx, ny, nz)
this.x, this.y, this.z = tx1, ty1, tz1