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Topic: HDRI

	Xedium3d - Tutorials - HDRI
		HDRI images are called High Dynamic Range Images because they have a high-range that can simulate different amounts of light.
		HDRI images can have a much higher range since it stores values differently.
		The main format of HDRI images are Radiance *.hdr files.
	www.xedium3d.com /tutorials/hdri/hdri.html (385 words)

	METINSEVEN.COM - HDRI-Studio
		As you can see the differently colored softbox lights in the HDRI provide a varied lighting and reflection result, with nice, tinted soft shadows being cast from the objects in the scene, while the HDRI intensity is not even at full strength and the renderer's settings are not optimal.
		The Neutral HDRIs provide a balanced monotone lighting, the Gels are there to add some moody color variation to your lighting and the Abstract ones are useful for graphic effects in your lighting and reflections.
		Each HDRI is available in the widely supported.hdr format and you can select several different resolutions for different applications, ranging from large-scale environment lighting to detailed close-ups.
	www.metinseven.com /review_hdri-studio.htm (732 words)

	Hyperfocal Design - HDRI in Lightwave
		If you are not up to speed on HDRI or the lingo, you may wish to first read our Understanding HDRI article.
		One HDRI: Use one HDRI for both your background image and for your lighting, either mapping to a 3d inverted sphere or as a lightprobe environment.
		Then use another HDRI mapped to another inverted sphere which will provide lighting to the scene but will not be visible in the render.
	www.hyperfocaldesign.com /tutorials/hdri-lightwave-tutorial.html (1515 words)

	backgrounds and hdri
		since hdri is not only usefull for lighting we have to know how to use it for backdrops and reflection (refraction too).
		the resolution of a hdri is compared to high res background images poor so it's often not possible to use it for the background.
		i adjust the brightness of the hdri too and for this example i raise it up to 350% because the enviroment is pretty dark.
	www.dbki.de /tutorials/eng/background/index.htm (360 words)

	Stitched HDRI
		This is a first attempt using fully automatic Gradient Domain High Dynamic Range Compression to compress the bightness range of the HDRI to the range of a computer monitor.
		I found that in the time it took me to take the pictures (about 50 minutes for 320 photos) the light changed significantly, the resulting HDRI is still smooth and looks very good but it is not a "snapshot" in time of the lighting conditions.
		Of course the whole process could be streamlined significantly by trading off some of the resolution for fewer pictures with a wide angle lens (not every application requires an 18,000 pixel wide pano) and I could have shot brackets that were further apart reducing the overall number of images.
	www.gregdowning.com /HDRI/stitched (1829 words)

	Freelance HDRI Services
		This is due to the fact that the correct lighting, highlights, contact shadows and reflections are contained in the HDRI photographs captured on-set during the live action shoot.
		The HDRI data can now be used in 3D to recreate the exact same lighting conditions that was present in the 'real world' at a specific moment in time.
		A HDRI photograph is unique in the fact that it stores both colour and intensity values of the environment, as the image integrates numerous exposures (camera stops) of the environment in one file at an extraordinary high colour depth and image resolution.
	anti-matter-3d.com /Freelance_HDRI_Services.html (2461 words)

	HDRI - CGAFaq
		Typically each HDRI pixel component is represented as a floating-point value corresponding to some physical measure of the energy in that pixel.
		HDRIs can be synthesized from real-world scenes by combining multiple photographs of the same subject taken at different exposures.
		Since HDRIs are a better model of reality, renderers that use HDRIs as the source images for environment or texture maps can generate more realistic images.
	cgafaq.info /index.php?title=HDRI&printable=yes (309 words)

	HDRI
		The entire HDRI term has been misunderstood, and despite the fact this feature had been incorporated since back in Lightwave 6.0, it is still surrounded in mystery.
		While there are some good documentation on HDR images, Lightwave users find it hard to apply to Lightwave itself as there does not appear to be much documentation as of yet to help even the experienced user get through it.
		This is because HDRI incorporates quite a few principles, and the more that one knows how things are being operated, the better the tweaking and resulting work will be.
	www.highpoly3d.com /writer/tutorials/hdri/hdri.htm (1720 words)

	HDRI I
		In the HDRI Image Settings dialog box, you will have access to parameters such as exposure control, clamping and to internal storage settings.
		Since HDRI images contains color values in quite a wide range (not just in 0..1 or 0..255) you need to specify which part you are interested in if you decide to use Linear internal storage.
		After the setup of the HDRI map, the Output values of the texmap (bitmap texture, for example) must be adjusted to reflect the white point that was defined in the HDRI Image Settings Dialog.
	www.splutterfish.com /sf/downloads/max/hdri/_contents/docs/html/hdri_i.htm (1031 words)

	3d studio max tutorial
		HDRI stands for high dynamic range image - sometimes refered to as a radiance map.
		HDR images have the important property that their pixel values are proportional to the amount of light in the original environment where the HDRI was captured.
		In the HDRI scene you can see how the strength of the reflections is nicely adapted depending on the reflective properties of each ball.
	www.the123d.com /tutorial/general/hdri.html (965 words)

	"Full Precision"Render and You - Tutorials - LightWave 3D®
		A more extreme example would involve using it to pull a manageable image out of a completely unruly HDRI map, as in some cases these images appear to only contain data in areas showing windows or light sources, when they in fact are hiding entire data in the dark areas.
		In this case, adjusting the range of the HDRI map to something that is easier to see without further tweaking may be in order.
		You can also choose to use HDRI as the global light source, and place item lights in order to generate a more specific lighting direction, generate caustics, or provide different shadows than those which are based entirely on your maps.
	www.newtek.com /products/lightwave/tutorials/rendering/fullprecision/index.html (5350 words)

	Trinisica
		HDRI is something that I have started to get more and more questions about in terms of what it really is and how it is used.
		In contrast to that you've got the HDR images which have the important property that their pixel values are proportional to the amount of light at any given pixel.
		In this [fig 2.4] image a HDR image has been placed on a plane in the scene, these types of white planes are commonly used in scenes with reflective areas and might be configured to look like a 'standard' light reflector, window or door openings.
	www.trinisica.com /sub_learn_typedissue.asp?lv=3&mode=1&issue=002 (1472 words)

	HDRI tutorial
		But the render is still a bit slow and noisy due to the contrast of the HDRi map used for the skylight.
		Because diffuse lighting is a far less precise thing than reflections, and because the contrast in some HDRI maps can confuse the lighting, wasting time, we can 'blur' the HDR image a little in order to get a faster and cleaner render.
		Note at last the HDRi reflection of the window on the ring: it's all blown up; then note in the middle the windows reflection laying on the table reflected on the ring: you start seeing the trees out of the window, more visible in the third reflection that is on the table.
	www.splutterfish.com /sf/contrib/tutorials/gabry_hdri_tut/_contents/index.html (1487 words)

	www.hello-napalm.com - Web Site of Nathan Fariss - HDRI - Using It
		In this half, my goal is to show you how to easily use hdri image that you just made (assuming you just completed part 1 of the hdri tut) in a 3d scene using 3dsmax, the Splutterfish HDRI loading plugin (for older versions of Max) and Brazil/Rio.
		it is also possible to use the hdri for correct reflections (so that bright spots won't be clamped on objects that aren't very reflective and so that bright areas will be blown out on very reflective objects).
		First off, our hdri is currentlt set to be screen mapped, but its a panorama, so it should really wrap all the way around our scene, so in the material editor, under the 'coordinates' rollout, be sure 'environment' is checked and select 'spherical environment' from the dropdown list nest to it.
	www.hello-napalm.com /tuts/tut_hdri_pt2.html (1426 words)

	LightWorks User - HDRI
		If this were to be done with an external building shot, the surrounding HDRI would be able to provide not only a convincing approximation to natural daylight conditions, but also include the surrounding environment reflections.
		HDRI images can be created through the use of either a light probe, or a digital camera in combination with either a silver ball or a fish-eye lens.
		Several third party software tools currently exist to allow HDRIs to be created from multiple photographs taken at different light exposure levels, and as interest in, and knowledge of, high dynamic range image formats and their usefulness grows, it is likely that more and more such tools will appear in the market.
	www.lightworks-user.com /hdri.htm (1320 words)

	3DTotal Tutorials (Site not responding. Last check: 2007-10-13)
		I tried to detail as much as possible the steps that one has to follow, in order to help the ones with the means, but haven't used them yet.
		Which means that there are only 256 levels of luminosity, which doesn't cover by far the range that can be captured by a camera, with different levels of exposure.
		HDRI Import plugin (3D Studio Max doesn't know how to use floating point images, as it is the case with the HDR format, so u will need HDRI.bmi, a free I/O plugin from the good folks at Splutterfish.
	www.3dtotal.com /team/Tutorials/hdri/hdri_1.asp (574 words)

	www.hdri.info - HDRI (Site not responding. Last check: 2007-10-13)
		In order to gain such image data it is necessary to apply particular methods, and special data formats are indispensable for the saving process.
		In the area of 3D a method is used which is, above all, very intriguing: the possibility to use HDRIs for the lighting of a scene.
		The technique of using HDRIs for the illumination of computer generated scenes was considered part of this work, but during my research I somehow got caught by this fascinating subject.
	www.hdri.at /en/hdri_en.htm (461 words)

	HDRI Creation and Editing in CS2 - Page 1 - Reviews Articles
		Creating a HDRI in CS2 is as simple as selecting the files to use, then selecting the shutter speed and f-stops used for each image.
		Before you merge the HDRI you are presented with a preview window showing the HDRI in the center screen and LDR images used to construct it down the left hand side.
		Performing the final merge to HDRI operation on an image at 10,000x5,000 took around 5 minutes, but again on a slow PC this is FAST for such a large file.
	www.highend3d.com /articles/reviews/6.html (1675 words)

	Hyperfocal HDRI Skies - HDRI DVDs
		Real-time HDRI skies for games allow the use of dynamic exposure adjustment, which can mimic the human eye adjusting to different light levels.
		You don't even need to be using HDRI lighting to benefit from Hyperfocal's HDRI skies - one of the drawbacks to traditional sky textures is that you are limited to the low dynamic range of the single exposure level provided.
		HDRI sky textures allow you perfectly match the exposure level and mood of your 3d scene.
	www.fxshare.com /dvd_store/hdri/29.html (867 words)

	HDRI-Studio license agreement
		transfer the HDRI Image File and the benefit of this license to another person provided that the recipient has agreed to accept the terms of this license and at the same time as transferring the HDRI Image File you transfer all your copies of the HDRI Image File or destroy all copies not transferred.
		Since decompression of the compressed file constitutes your unsealing of the HDRI Image File you will not be entitled to cancel this license agreement once you have indicated your acceptance of its terms.
		This license, which constitutes the entire agreement between you and the Owner relating to the HDRI Image File, shall be subject to and construed in accordance with the law of England and Wales and any dispute arising shall be submitted to the exclusive jurisdiction of the English courts.
	www.hdri-studio.com /license.html (986 words)

	HDRI rescources + Tips + Mini Tut + Scene file - C4D Cafe
		Since all the data in HDR images can't be displayed on a monitor, HDRI apps usually have a tonemapping feature, which averages the light/colour in the HDR image.
		This is really handy as you don't have to edit the HDRI before using it, when you raise the gamma you might want to lower the luminosity brightness slider a little, or lower the brighness/lightness in the layer/effects.
		Compositing with HDRI: Compositing with HDRI is a great idea, ofcourse hard unless you have a compositing background image to suit the spherically mapped hdri.
	www.c4dcafe.com /ipb/index.php?showtopic=6790 (2231 words)

	HDRI - WikiCG (Site not responding. Last check: 2007-10-13)
		In computer graphics and cinematography, high dynamic range imaging (HDRI for short) is a set of techniques that allow a far greater dynamic range of exposures than normal digital imaging techniques.
		For passes where clipping can be a problem (mostly with particles, effects, or volumetrics that get too bright when they add up in the same place), you can bring the brightness down on any overexposed area, and you'll see detail appear that would have been clipped if you rendered at 8-bit or 16-bit.
		HDRI Volume 1.0 is a commercial set of 15 custom created High Dynamic Range Images (HDRI).
	www.wikicg.com /wiki/index.php/HDRI (755 words)

	Max-Realms \| 3ds Max Community - Tutorials (Folder) (Site not responding. Last check: 2007-10-13)
		This is because a sharp un-blurred HDRI used for lighting can often cause your render to look dirty and poorly sampled, while a blurry one can improve this greatly without changing the lighting of your scene at all.
		Not only that, but a blurry HDRI can actually speed up the rendering process, because there are less fine-details in the HDRI to be processed which make no difference to the lighting of your scene anyway.
		The Reflections HDRI is of course the one to use for your object’s Reflections channel.
	www.max-realms.com /modules/tutorials/guide_to_hdri_lighting.php (3949 words)

	HDRI FAQ (Site not responding. Last check: 2007-10-13)
		HDRI is not identical with the data format HDR.
		HDRI merely denotes the idea of recording images which include more luminance information than conventional images.
		HDRI is neither a special data format nor a certain way of saving panorama images.
	www.hdri.at /en/popup_en/hdri_faq_en.htm (534 words)

	Brock J. Stearn - IBI - HDR
		HDRI is an image that records a whole range of illumination properties.
		The best application I have found for creating HDRI is HDRShop, but there are other utilities available such as MkHDR a command line utility, and HDRIE and Photogenics HDR which are both commercial applications with some minor image editing capabilities.
		Such as you may have a blurred HDRI file for the diffuse color but you may have a different tweaked one for specular.
	www.myanimator.com /research/hdri_ibi/notes (3620 words)

	www.hello-napalm.com - Web Site of Nathan Fariss - HDRI - Making Your Own
		Brazil Rio (free version of Brazil) This is updated from the original hdri tut, which linked to the Public Test build of brazil.
		You can, though, shoot the sphere from 2 separate angles, 90 degrees apart, open each image (not creating a hdri yet) in hdrshop, transform each image from the mirrored ball to lat/long, resave each as an LDR image, open them all in photoshop and blend together the layers with the same exposure.
		You should now be able to use this hdri to both light a scene in 3d and provide nice reflections.
	www.hello-napalm.com /tuts/tut_hdri.html (2617 words)

	CGChannel Forum - View Thread - Hyperfocal HDRI Skies
		Each HDRI Sky can add instant, super realistic lighting to 3D scenes, with accurate reflections and a dynamic background that reacts realistically with semi-opaque surfaces such as tinted glass or atmospheric effects such as dust and smoke.
		The hemispherical HDRI Skies cover a range of time and weather conditions, and feature up to 16 stops of dynamic range.
		Hyperfocal's HDRI Skies are priced at $59 USD for the large version, and $39 for the medium resolution file.
	www.cgchannel.com /forum/viewthread?thread=18349 (439 words)

	HDRi Lighting in Maya using Mental Ray - RenderAid.com (Site not responding. Last check: 2007-10-13)
		The beauty of HDRI rendering is enhanced by reflecting the environment.
		Click on the folder icon on the right side of Image Name and select the HDRI you want to use (Note Maya will spit an error out and not display the HDRi, as Maya doesn't recognize the 32 bit format of HDRi images.
		In Hypershade connect the output color from the HDRI file to the color channel of the same Lambert shader.
	www.renderaid.com /infoDetail~p~d~id~1068~sid~1001~f~Tutorial.aspx (477 words)

	AHDRIA and High Dynamic Range Imaging
		In the worst case, this will destroy the HDRI acquisition entirely; in the best case, the images can be resampled and realigned either manually or with appropriate software.
		Very Cheap HDRI How to generate HDR scenes using a consumer-level digital camera which doesn't support manual control of the shutter speed or aperture.
		Stitched HDRI Using a combination of HDR imaging with standard panorama stitching to generate larger-field HDR images.
	www2.cs.uh.edu /~somalley/hdri_images.html (2873 words)

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