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Topic: Caustics

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	Encyclopedia: Caustics (Site not responding. Last check: 2007-11-06)
		Caustic substances, such as drain cleaners, are harmful to living tissue.
		For example a caustic effect may be seen when light refracts or reflects through some refractive or reflective material, to create a more focused, stronger light on the final location.
		In differential geometry a caustic is the envelope of rays either reflected or refracted by a manifold.
	www.nationmaster.com /encyclopedia/Caustics (856 words)

	Caustics -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-06)
		This is accomplished by raytracing the possible paths of the light beam through the glass, accounting for the refraction, reflection, etc. Reference: (British nuclear physicist (born in Germany) honored for his contributions to quantum mechanics (1882-1970)) Max Born and Emil Wolf, Optics.
		In (The science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions) chemistry a caustic (That which has mass and occupies space) substance is one that 'eats away' or chemically burns other materials.
		Caustic substances, such as (A pipe through which liquid is carried away) drain cleaners, are harmful to (Click link for more info and facts about living tissue) living tissue.
	www.absoluteastronomy.com /encyclopedia/c/ca/caustics.htm (275 words)

	Caustics (Site not responding. Last check: 2007-11-06)
		The word "caustic" is from Latin, and implies burning, because the intensity of the light is increased near a caustic.
		Caustics can be produced by reflection, as here, or by refraction, in a variety of ways, and are evidenced on a large scale by bright lines.
		A caustic surface is a cusp-locus of the wavefronts.
	www.du.edu /~etuttle/math/caustic.htm (858 words)

	Generating Caustics (Site not responding. Last check: 2007-11-06)
		Caustics are generated when beams of light are focussed on a particular point in space.
		Another example of a caustic is the result of light focussing due to specular bounces off of a shiny material such as metal.
		However, the reason that the caustic is so much brighter than surrounding areas on the surface is that several light rays were focussed there.
	www.amath.washington.edu /~calhoun/demos/CS_graphics/caustics/caustics.html (602 words)

	Xah: Special Plane Curves: Caustics
		Caustics were first introduced ad studied by Tschirnhausen in 1682.
		Caustic is a method of deriving a new curve based on a given curve and a point.
		Given a curve C and a fixed point S (the light source), catacaustic is the envelope of light rays coming from S and reflected from the curve C. Diacaustic is the envelope of refracted rays.
	www.xahlee.org /SpecialPlaneCurves_dir/Caustics_dir/caustics.html (265 words)

	Images with caustics by Henrik Wann Jensen
		Caustics are formed by light that is reflected or transmitted by a number of specular surfaces before interacting with a diffuse surface.
		Examples of caustics are the light patterns on the bottom of a swimming pool and light focused onto a table through a glass of cognac.
		Caustics are impossible to simulate using radiosity or ray tracing but very easy with photon mapping :-) A photon map is build by tracing photons from the light source into the scene and storing these as they interact with the surfaces in the model.
	graphics.stanford.edu /%7Ehenrik/images/caustics.html (618 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		Caustics can be described as the light pattern you see at the bottom of a pool on a sunny day.
		Caustics are caused by the fact that light is reflected or refracted one or several times before actually hitting a surface.
		Caustics Generator is released under GNU GPL license and is thus free software.
	www.lysator.liu.se /%7Ekand/caustics (290 words)

	ucf :: graphics group :: Real-time Caustics Rendering
		The main advantage of caustics mapping is that it is extremely practical for games and other interactive applications because of its high frame-rates.
		Lastly, the caustics mapping algorithm does not hinder the rendering of other optical phenomenon, such as shadows, and hence can be integrated into current rendering systems easily.
		All the refracted light rays converge more or less at the same point, therefore the caustic appears to be a small bright spot on the receiver surface.
	graphics.cs.ucf.edu /caustics (532 words)

	Reference Material - Caustics (Site not responding. Last check: 2007-11-06)
		Flickering is a common result of using Caustics in an animated scene.
		Caustics are concentrated light reflections caused by refraction through a transparent surface.
		Caustics settings are located under the Global Illumination panel under the Settings Tab within Layout or through any light properties also give access to this panel.
	art-design.smsu.edu /yarberry/Courses/Reference/Caustics/index.html (234 words)

	[No title]
		Caustics is a new texture property under the area of finishes.
		Above, with the thinner walls (with less refraction) the caustics are less pronounced and more evenly diffused through the shadow, but when we get to the part of the shadow cast by the thicker, more refractive base, suddenly the caustic becomes more pronounced and more tightly focused near the center.
		Of course, since this is a simulated caustic, there is no correspondence between the degree to which the caustic is focused or diffused and the shape, size and refractivity of the object.
	www.lobos.nih.gov /Charmm/Povray3/pov3000c.html (2196 words)

	Caustics
		Caustics are an addition to your rendering that calculates photons of light starting at a light source (like real light), which can be reflected, refracted, bounced off mirrors, or concentrated by a lens, accurately simulating more of the ways real light can move through a scene.
		Another effect of the Caustics is that the vase looks better "attached" to the top of the dresser in the version on the right, because of the realistic reflected light bouncing back from the glass to the wood.
		The choice of this dresser-mirror scene to demonstrate Caustics was an homage to an older Dresser image by Larry Gritz, the creator of BMRT, which supports Specular-to-Diffuse Illumination.
	3drender.com /light/caustics.html (543 words)

	Lightrays - Raytrace&Caustics - Tutorial
		Caustics are are concentrations of light that appear with, for example, magnifying glasses when light shines through them.
		This is an extreme example, but a wineglass also casts these caustics, although a little weaker (the doesn't get bundled together as much as with the lens of a magnifying glass).
		The shadow is, however, in some areas still too defined - You can clearly see the edge of the glass.To lessen this effect a little, copy (don't choose instance!) the spotlight and change the shadow type back to shadow map.
	www.lightrays.de /html/tutorials/caustics/caustics_tut_eng.htm (743 words)

	Faked Caustics (Site not responding. Last check: 2007-11-06)
		Caustics are light effects that occur if light is reflected or refracted by specular reflective or refractive surfaces.
		This caustic effect is limited to areas that are shaded by the transparent object.
		You'll get no caustic effects from reflective surfaces nor in parts that are not shaded by the object.
	www.blastwave.org /docs/povray-3.50c/povdoc_203.html (222 words)

	Caustics - Halflife2.net
		The lights appear to have caustics around them, of course this is baked into the texture and not dynamic, but it looks cool though.
		Caustics are those effects you see when light passes through a distorted surface.
		Caustics are those funny looking waves of light in the bottom of ie.
	www.halflife2.net /forums/showthread.php?t=16074 (714 words)

	Caustics \| Poison Control Center - Children's Hospital of Philadelphia
		Skin contact with caustics can cause mild to severe burns depending on the strength of the product, the amount splashed on the skin and the duration of contact with the skin.
		A caustic product splashed in the eye may cause pain, redness, blurry vision, and abrasions or burns to the cornea, the protective coating of the eye.
		The children most susceptible to medical complications are those who inhale caustic fumes in an enclosed area for a long time and those with pre-existing airway disease, such as asthma or bronchitis.
	www.chop.edu /consumer/jsp/division/generic.jsp?id=70980 (922 words)

	CINEMA 4D Highlights (Site not responding. Last check: 2007-11-06)
		Caustics provide even more realism in your 3D images by simulating the hyper-focusing of light as it reflects off surfaces or within the volume of an object.
		Caustic effects like the reflection of light from the face of a watch or on the bottom of a swimming pool are easy to create with CINEMA 4D's Advanced Render Module.
		Like radiosity, the caustics engine provides several rendering parameters that can be tweaked to optimize render times and image quality.
	www.maxon.net /pages/products/c4d/modules/advanced_render/hl_caustics_e.html (177 words)

	Fast Rendering of Caustics using Photon Mapping and Texture Maps
		Caustics are an indirect specular lighting phenomenon that adds realism to the lighting in the scene.
		One is a high-resolution map, used for directly visualizing the caustics, and another is a lower resolution map used to augment the rendering stage.
		Converting the caustics to textures and rendering using the z-buffer renderer provides a very efficient, view independent alternative to the ray tracing secondary stage.
	www.soe.ucsc.edu /classes/cmps260/Spring02/submit/dbrooks/causticWeb (3127 words)

	Gamasutra - Features - "Inexpensive Underwater Caustics Using Cg"
		Inexpensive Underwater Caustics Using Cg There's something hypnotic about the way water interacts with light: the subtle reflections and refractions, the way light bends to form dancing light patterns on the bottom of the sea, and the infinitely-varied look of the ocean surface.
		It is unsurprising, then, that their approach to caustics tries to model the actual process: rays are traced from the Sun to each vertex in the wave mesh.
		Logically, this means caustics will be formed most easily when light rays travel the shortest distance from the moment they enter the water to the moment they hit the ocean floor.
	www.gamasutra.com /features/20030903/crespo_01.shtml (1750 words)

	MAXON Computer Cinema 4D Tutorials: Caustics
		Among these new features are caustics, which are formed by light being reflected or transmitted by a number of specular (shiny) surfaces before interacting with a diffuse (light scattering) surface.
		Step 1: In order to generate caustics, you need three basic elements: a refractive or reflective object, a light to cast photons, and a surface for the caustics to be cast onto.
		Caustics will be visible on the surface of the water as well as the bottom of the tank.
	www.maxoncomputer.com /tutorial_detail.asp?tutorialID=192&site= (1828 words)

	Caustics
		Caustics can be computed into illumination maps or rendered as a part of the ray tracing process.
		The bump map is not necessary for the caustics test, but it should be noted that the grooved shiny surface will create an especially interesting light scattering in the caustics lighting.
		Note: Caustics illumination is attached as a texture map to target objects.
	www.phnet.fi /public/realsoft/rendering/caustics.html (1413 words)

	Caustics: Dropping the Cow into A Pool of Water (Site not responding. Last check: 2007-11-06)
		Caustics can use any image you can import into AE as a source for the 'pool bottom', it doesn't have to be a Photoshop file.
		Caustics uses the Water Surface source to generate the distortions.
		Move the Caustics effect ABOVE the Hue and Saturation effect, in the Effects Window.
	creativecow.net /articles/tierney_jim/caustics (1930 words)

	Caustics - TerraNuts - for Terragen and 3D Graphics
		The caustics generator was a big deal on the Yahoo list, Ashundar and a few other places about a year back.
		Since caustics are a product of water refraction, and the focus point depends on the distance from the underlying surface, you should naturally get a varying look to your caustics depending on the depth.
		This is difficult to simulate with the texture method, so we'll have to wait until TG has real caustics to make it 100% correct, but in the meantime simply fading out the caustic texture as it approaches the shore works pretty well for realism.
	www.terranuts.com /forums/showthread.php?t=971 (654 words)

	Reality FX Links (Site not responding. Last check: 2007-11-06)
		Very simply, caustics are caused by the refocusing of light as it passes through an object (refractive) or bounces off an object (reflective).
		Another example, this time of reflective caustics, is the rippled light seen on the walls around brightly lit swimming pools.
		Caustics can only be generated by self-illuminated geometry (referred to as a Geometry Light).
	www.users.bigpond.com /grajneil/brtut2.html (1092 words)

	Caustics: Project Home (Site not responding. Last check: 2007-11-06)
		With the advancements in real-time ray tracing and new global illumination algorithms, we are now able to render the most important illumination effects at interactive rates.
		One of the major remaining issues is the fast and efficient simulation of caustic illumination, e.g.
		The photon mapping algorithm is a simple and robust approach that generates high-quality results, and is the preferred algorithm for computing caustic illumination.
	graphics.cs.uni-sb.de /Caustics (157 words)

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