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我想弄清楚如何旋轉一個框架對象相對於它的當前位置。vpython「相對」旋轉一幀
例如一個物體指向北方,我說繞y軸旋轉180度。之後我說:傾斜90度,它從「世界」的角度來看。所以它指向下來,而不是起來。 (對不起,這個令人困惑的故事,如果你嘗試下面的代碼,並使用你的上下左右鍵,你明白我的意思)。
任何幫助將不勝感激。
import time
import numpy
from visual import *
# initialize variables
pitch_degrees = 0
roll_degrees = 0
yaw_degrees = 0
xangle = 0.0
yangle = 0.0
zangle = 0.0
# create the airplane frame. this will be our working object.
airplane = frame(make_trail=True)
# below are the elements that create the airplane
body = cone(frame=airplane, pos=(50,0,0), axis=(-150,0,0), radius=10)
body2 = cone(frame=airplane, pos=(50,0,0), axis=(50,0,0), radius=10)
wing = box(frame=airplane, pos=(35,0,0), size=(30,3,180))
tail = box(frame=airplane, pos=(-75,0,0), size=(20,3,50))
aileron = box(frame=airplane, pos=(-75,12,0), size=(20,24,3))
cabin = ellipsoid(frame=airplane, pos=(30,5,0), axis=(1,0,0),size=(45,24,12))
#painting
for obj in airplane.objects:
obj.color = color.red
body.color = color.white
cabin.color = (0.5, 0.5, 0.5)
cabin.opacity = 0.8
# I'm experiencing some jitter in my screen when starting up (yay ati....)
time.sleep(2)
# loop forever
while True:
# are there any keys pressed? if so, act on them.
if scene.kb.keys: # event waiting to be processed?
s = scene.kb.getkey() # get keyboard info
if (s == 'up'):
pitch_degrees = pitch_degrees - 1
if (s == 'down'):
pitch_degrees = pitch_degrees + 1
if (s == 'left'):
roll_degrees = roll_degrees - 1
if (s == 'right'):
roll_degrees = roll_degrees + 1
# convert degrees to radians
zangle = numpy.radians(pitch_degrees)
xangle = numpy.radians(roll_degrees)
# execute the actual rotation.
# but this should be relative to its current rotation :(
airplane.rotate(angle=zangle,axis=(0,0,1))
airplane.rotate(angle=xangle,axis=(1,0,0))
# some delay because i'm a dirty boy
time.sleep(0.005)