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BruceSherwood / vpython-wx

VPython based on wxPython
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make_trail failing for ball.pos = vector(t,0,0) #14

Closed BruceSherwood closed 10 years ago

BruceSherwood commented 11 years ago

from visual import * ball = sphere(pos=(0,0,0), radius = 5, make_trail = True) ball.trail_object.radius = 3 # no problem if 0 t = 0 while t <= 100: rate(50) ball.pos = vector(t,0,0) # no trail unless trail_type="points" t += 1

No problem if the update is this: ball.pos = ball.pos + vector(1,0,0)

BruceSherwood commented 10 years ago

The problem is with the thick version of the curve object:

y = 1 # if y is 0 and radius is nonzero, nothing is displayed c = curve(pos=[(0,y,0)], radius=0.2) c.append(pos=(0,y,0)) c.append(pos=(1,y,0))

There is also a trail problem: ball.pos.x = t or ball.pos.x += 1 does not trigger adding to trail.

BruceSherwood commented 10 years ago

Fixed both trail problems by not duplicating curve points and by detecting changes in ball.pos.x. There remains a bug in the curve object which I'll post separately.