Fluent viewpoint rotation towards an object

[4711]

I wrote some code myself to solve the problem:

import math
import viz


# --- REQUIRED FUNCTIONS --- #

def Angle2Euler( angle ):
	
	euler = 0
	
	# Not defined for negative values
	if angle < 0:
		return 0
	
	# Calculate 'euler' depending on quadrant
	else:
		if angle <= 90:
			# Q1
			euler = 90 - angle
		elif angle <= 270:
			# Q2 & Q3
			euler = -( angle-90 )
		else:
			# Q4
			euler = 360 - angle + 90
	
	return euler


def Cart2Pol( x, y, unit='rad' ):
	
	# Radius
	r = math.sqrt( math.pow(x,2) + math.pow(y,2) )
	
	# Angle in [rad]
	t = math.atan2( y ,x )
	
	# Angle in [deg]
	if unit.lower() == 'deg':
		t = math.degrees( math.atan(float(y)/float(x)) )
		if x < 0:
			t += 180 # Q2 & Q3
		elif x > 0 and y < 0:
			t += 360 # Q4
	
	return r, t


def LookAt( Target ):

	# Get current position and orientation
	Pos = viz.MainView.getPosition()
	Ori = viz.MainView.getEuler()
	
	# Define position as 2D point 'P'
	P = [Pos[0], Pos[2]]
	
	# Define target as 2D point 'T'
	T = [Target[0], Target[2]]
	
	# Shift 'P' into origin (= 'P0') and
	# move 'T' accordingly (= 'T0')
	T0 = [T[0]-P[0], T[1]-P[1]]

	# Get location of 'T0' as polar angle
	angle = Cart2Pol( T0[0], T0[1], 'deg' )[1]
	
	# Convert angle to Vizard's Euler style
	euler = Angle2Euler( angle )
	
	# Create rotation action towards target
	rotation = vizact.spinTo( euler=[euler,0,0], time=2 )
	
	# Apply rotation to MainView
	viz.MainView.runAction( rotation )


# --- AN EXAMPLE --- #

# Go!
viz.add('court.ive')
viz.go()

# Add a box behind the MainView
box = viz.add('box.wrl')
box.setPosition([-5,1.7,-10])

# Look at the box
LookAt( box.getPosition() )

This may not be the easiest or most elegant way, but it works!