def getSurfaceInteraction(self,r):
"""
Method to get back the surface interaction information for a ray
Returns the list
type: surface type
distance: distance from current ray position to surface
pos : Position, intration point with surface
norm: surface normal at that point
refrative : refrative index (if refracting surface)
This also add the ray intensity to the cloeset pixel
"""
# get interaction with super class
info = ImagePlane.getSurfaceInteraction(self,r)
# Add ray to pixel
i = int(round(self.xpixel*(info.position.x + self.xsize/2 - info.point.x)/self.xsize))
j = int(round(self.ypixel*(info.position.y + self.ysize/2 - info.point.y)/self.ysize))
# Check if pixel is in image (note due to distrortions it may not be)
if i >= 0 and i < self.xpixel and j >=0 and j < self.ypixel:
self.image[i,j] += r.intensity # Add it to the image
# Retun info to calling object
return info
