UberLight

This page uses Larry Gritz's uberlight to roughly mimic examples found in: Ronen Barzel's article "Lighting Controls for Computer Cinematography" from the Journal of Graphics Tools. An abstract of this article can be found at Barzel97. This paper was also reprinted in the Siggraph '98 RenderMan Course.

In addition to the uberlight, the other nonstandard shader used in theses examples is smoke.sl from App. Note #20. NOTE: I didn't try to completely reconstruct the objects, camera, or light palcement. Also, I was lazy and used ambient light instead of using any fill lights. But hopefuly, everything is close enough to get the point through.

Another point of interest, the RIBs were made using Houdini. Notice how nice the RIB look and all of the friendly comments.


fig1

fig1.tiff fig1 RIB Cylinder and cube on the floor, torus in midair.


fig2

fig2.tiff fig2 RIB Same as Fig. 1, with a conical key light.


fig3

fig3.tiff fig3 RIB Selection Same as Fig. 2, but the torus is unaffected by the key light.


fig5

fig5.tiff fig5 RIB Rouned rectangle shage.


fig6

fig6.tiff fig6 RIB A sheard barn door light.


fig6b

fig6b.tiff fig6b RIB Same as Fig. 6, but with the shear turned off.


fig7

fig7.tiff fig7 RIB Same as Fig.5, but with soft edges.


fig9

fig9.tiff fig9 RIB Same as Fig. 2, but with a sharp cutoff.


fig10

fig10.tiff fig10 RIB Same as Fig. 2, but with a gradual cuton.


fig11

fig11.tiff fig11 RIB Basic shadows. Same as Fig. 2, but with shadows from the key light. For prman shad.rib was used to generate the shadow-map.


fig12

fig12.tiff fig12 RIB Shadow selection. Same as Fig. 11, but the cube casts no shadow. For prman shad.rib was used to generate the shadow-map.


fig17

fig17.tiff fig17 RIB Projecting a matte image as a "cookie cutter" to get alternate light shades. This RIB uses star.tiff for a texture-map


fig17b

fig17b.tiff fig17b RIB Same as Fig. 17, but the width and height are set to 0.5 instead of 1.0.


fig18

fig18.tiff fig18 RIB Instead of using simulating shadows, using a projected matte image of tiny stars, star2.tiff


fig18b

fig18b.tiff fig18b RIB Same as Fig. 18, but with the atmosphere shader turned on.


fig20

fig20.tiff fig20 RIB Projecting a color image to get a slide effect. The image used in this case is: pen.tiff


fig21

fig21.tiff fig21 RIB Intensity distribution across beam


fig22

fig22.tiff fig22 RIB Intensity falloff with distance.


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Last modified: Thu Mar 13 22:00:45 PDT 2008