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BryceTalk (Tues) Bryce Lights
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BryceTalk (Tues) Bryce Lights, July 6, 1999
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Journeyman: http://www.wheel-of-life.com/forgotten.html Clay: (use the diffusion in the light editor to soften the lights edges) Journeyman: even for outside scenes like this one yes i see that now Clay, thanks Clay: :-) AuntiAlias: good points! Journeyman: the lighting in that was just one spotlight in a volumetric world AuntiAlias: Purusha, your question? Journeyman: you might be able to see I applied a gel to that light so it streams more Clay: (explain the mask Janak) Purusha: you all are answering it (the distinction between vol lights and vol world) Descendere: Ooops!!! There's the boss!! Thanks guys!! Clay: cya Fred AuntiAlias: k.. then SunDogDeb... your question? SunDogDeb: Does studying photo lighting help with setups? (positions of lights, etc.) How is Bryce drastically different? (newbie) Journeyman: the mask? finderic: hello Clay Clay: gel sorry AuntiAlias: how about we take the question after Journeyman discusses the mask... er.. gel SunDogDeb: ok Journeyman: ok Clay: hi find Journeyman: so what is the question? AuntiAlias: (explain the mask Janak) in the forgotten.html scene.. Journeyman: okay Purusha: how to make good gels for that 'streaming' effect Journeyman: it is just a simple texture I can check... I will get the exact settings Journeyman: the lighting level ws 251 the blur around the edge is 38 Clay: http://www.phase2.net/claygraphics/creation.html here is a scene using a volumetric radial light set to give the planet a glow Journeyman: I don't know what you mean about explaining the gel JPSullivan: (What Is It? ) Purusha: ? Clay: this is also an example of tweaking a texture so the light will work like you want Journeyman: well the gel is just a texture or picture you can apply to a light Journeyman: it is like holding something in front of a light so when you apply a gel to a light AuntiAlias: ... like a cookie (traditional term used in stage lighting) Journeyman: so when you put your light in a scene if you have a brick pattern on your light it will show a changing in the light see what I mean? AuntiAlias: Gel uses the diffuse color information to determine what shows and what doesnt. JPSullivan: As if it were shining through the shape from the source, right? AuntiAlias: Light is full light intensity, dark is not-light showing Journeyman: yes if you had a branch texture it would look like you held a branch close to the light Journeyman: there would be a fuzzy branch outline on the wall AuntiAlias: also, you can create a picture with blurred edges (gray values) in it and therefore make fuzzy soft shadows that way! : ) I've got an answer to the question about studio lighting, too... : ) JPSullivan: Best to use a picture with only a single color? Or does it matter? AuntiAlias: the question was...would the study of studio lighting be good for Bryce? yes, any study of traditional light techniques is good. In photo studio lighting, you will positionand aim your lights in order to help define the shapes of objects. You have the main light (key light) and usually something to highlight the object from Journeyman: well that will only dull your entier light AuntiAlias: behind. Also, depending on what else is in the background, you may have a small kicker light that illuminates the background, so that the object of interest is "separated" from the background. Journeyman: if you use a texture, it is like the alpha channel of a light <wonders why everying is so silent> JPSullivan: Bravo! Clay: heheh JPSullivan: :-) SunDogDeb: ? AuntiAlias: Any other questions? yes, SunDogDeb? SunDogDeb: Yes Purusha: Clay when you say "volumetric radial light" you mean "volume visible light?" (on a radial light) from the popup in the light edit dialogue? Clay: yes SunDogDeb: How high a light count before it starts eating into render time seriously? Journeyman: depends on the light Clay: that varies AuntiAlias: I once did a study of that -- back in the days of no volumetric world/light Journeyman: also the brightness of the light I think too Clay: on the complexity of the scene too AuntiAlias: what happens with the scene rendering is this: SunDogDeb: What's high render time types? Journeyman: the textures Clay: Volumetric Conical lights tend to take longer AuntiAlias: bryce calculates the color for a given pixel. In doing so, it considers the texture, and the objecst in the scene, and the light source and shadow Journeyman: actually radial lights take longer than conical Clay: true AuntiAlias: Things that add to render time are additional lights, because each light is another light and shadow to calculate... Journeyman: because they emit light in every direction Rivak: this all goes back to my original question of why they take so long to render... JPSullivan: Any tips on the SIZE of the light source and how it would affect the scenes . . . and render time? Journeyman: well a normal light just bounces around and gits objects right? bit a volumetric light has to move a little tiny bit Sky Pilot: ? Journeyman: calculate the brightness and then bounce that around from there AuntiAlias: Here is a record of a simple scene with multiple lights. (You can see the render effects in the Report REnder dialog box) more "intersect attempts" Journeyman: so every little tiny bit it has to emit another light beam SunDogDeb: Avg. # of lights for interior? Toy Story had 32 max. Journeyman: you see what I mean rivak? AuntiAlias: 0 lights sun only: 2:03; 1 light: 3:11, 2 lights 4:08; 3 lights 5:01, and 4 lights 5:50 Rivak: yes AuntiAlias: so, for that scene, each light added about a minute to the render time... SunDogDeb: Ah! Thanks! AuntiAlias: The interior scene from earlier, the Dens.. there are about 18 lights.... 12 in the chandelier, 2 on mantle, 2 in fireplace, and some spotlights at the other end of the room But.... (about that scene mentioned earlier)... the scene depends too... If you have transparency, for instance, and refraction, render time goes up
>>>> Next up: Water Caustics, Negative Lights |
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Opinions expressed in this BryceTalk Event belong to
the individuals who stated them;
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