Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Ray tracing- Is luminance being traced?

  1. Mar 25, 2014 #1
    My understanding of ray tracing is that it maps out luminance for a scene. Now with ray tracing (backwards ray tracing that starts from the camera outwards) does each ray have a luminance value associated with it? In the case of a perfectly diffuse surface, can one simply take the mean of all of the secondary rays luminance to arrive at a luminance value for the primary ray or is this assumption wrong? If L0 are the primary rays luminance, and L1 ,L2 ,L3, L4 ,L5 are the secondary rays that are created due to the diffuse surface. (see Diagram for explanation).
     

    Attached Files:

  2. jcsd
  3. Mar 25, 2014 #2

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Interesting question- in radiometric terms, rays in a ray trace are associated with radiance- a conserved quantity with units of W/(m^2*sr)- the quantity tells you how much power is propagating in a given direction.

    Luminance is the photometric equivalent to radiance- radiance that has been corrected for the spectral response of normal human eyes.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Ray tracing- Is luminance being traced?
  1. Optical Ray tracing (Replies: 8)

  2. Ray tracing rules (Replies: 1)

  3. Ray Tracing (Replies: 6)

  4. Ray tracing a thin prism (Replies: 42)

  5. Ray tracing in plasma (Replies: 0)

Loading...