2. Global Parameters - These affect everything

Global parameters specified in the scene file affect the whole render. A sample scene file listing of the global parameters is given below. The paramemters can occur anywhere in the scene file and in any order, though specifying them on the top together is a good idea. A sample scene file listing -

resolution 256
step 10
intensity 1.0
near_plane 0.1
far_plane 40.0
sharp_angle 45
conv_limit 0.0001


  1. Image Resolution (a `How big an image u want ?? ??) -
    The resolution parameter specifies the size of the preview window during the render. A lower size here would mean faster calculations however. So setting the resolution to 512 opens a 512 x 512 window. The default resolution is 256.

  2. Update Step -
    The update step specifies after how many radiosity calculation steps is the prview window to be updates. Smaller step would give a smoother preview, while making the calculations slower. The default step is 10.

  3. Intensity (hurray !! for brighter colors) -
    This is parameter can be used to scale the colors of all objects. This allows user to get brighter colors without effecting the reflectance values. The intensity scale factor is 0.2

  4. Near/Far Plane -
    These are the near/far clipping planes used while rendering the preview.

  5. Maximum Sharp Angle -
    This angle is used while calculating vertex colors. For all the triangles meeting at a vertex, the strategy followed is when fixing a color for its vertex, the color is averaged out over all the contributing triangles if the angle between their normals is less than this value. So this prevents averaging of colors at object edges and vertices where the surface changes abruptly. The default value is 45 degrees.

  6. Convergence Limit -
    This value is used to limit the number of iterations of the radiosity calculations. So when the deltaRAD of the shooting patch goes below this limit, the iterations stop. The default value is 0.00001


[ Back ]




Page last updated on 16 February, 2011. pialpharhoalphagammaAT cse.iitd.ac.in © Parag Chaudhuri , 2009
DCSE, IIT Delhi Valid HTML 4.0! Valid CSS! yahoo