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import math
import unittest
import random
import imath
import os
import IECore
import IECoreScene



class TestMeshPrimitiveShrinkWrapOp( unittest.TestCase ) :

	def testSimple( self ) :
		""" Test MeshPrimitiveShrinkWrapOp """

		random.seed( 1011 )

		# Load poly sphere of radius 1
		m = IECore.Reader.create( os.path.join( "test", "IECore", "data", "cobFiles", "pSphereShape1.cob" ) ).read()
		radius = 1.0

		# Duplicate and scale to radius 3, jitter slightly
		targetRadius = 3.0
		target = m.copy()

		pData = m["P"].data

		target["P"] = IECoreScene.PrimitiveVariable( IECoreScene.PrimitiveVariable.Interpolation.Vertex, IECore.V3fVectorData() )
		for p in pData:
			target["P"].data.append( p * targetRadius + 0.01 * imath.V3f( random.random(), random.random(), random.random() ) )

		self.assertEqual( len( target["P"].data ), len( m["P"].data ) )

		# Shrink wrap smaller mesh to larger mesh
		op = IECoreScene.MeshPrimitiveShrinkWrapOp()
		res = op(
			target = target,
			input = m,

			method =  IECoreScene.MeshPrimitiveShrinkWrapOp.Method.Normal,
			direction = IECoreScene.MeshPrimitiveShrinkWrapOp.Direction.Both
		)

		pData = res["P"].data
		for p in pData:
			self.assertTrue( math.fabs( p.length() - targetRadius ) < 0.1 )




if __name__ == "__main__":
    unittest.main()
