HDR Rendering & youBy: Dan SchmittouSpring 07’What you’ll learn•In this tutorial you’ll learn:–What HDR is all about.–Why to use it.–Simple example on how to use it.Terms used•HDRI -High Dynamic Range Imaging•HDRR -High Dynamic Range Render•LDRI -Low Dynamic Range Imaging•Radiosity -rendering algorithm that accounts for “bounced light” off surfaces.Why Use HDRR?•Can be used to create very realistic looking lighting and renders.•Doesn’t require complicated light rigs.Creating HDRR•What you’ll need–Basic knowledge of Lightwave–Basic Knowledge of Radiosity–An HDR Image–patienceSimple area light with shadowsIn the scene:- Objects- One area light no Radiosity- Brass preset texture on toridRadiosity With HDRIIn the scene:- Objects- One HDR image with Radiosity enabled- Brass preset texture on torid- NO lights!!HDRR…what is it?•HDRR (High Dynamic Range Rendering)–Rendering solution that uses and HDR image to calculate light, reflections, and color in a scene•A HDR image is comprised of multiple pictures taken at different exposure settings, allowing for a greater “dynamic range” between highlights and shadows.•HDR images also retain a high level of color information within the image. Allowing for better reflections and more accurate colors in the scene.LDR vs HDR•Source http://www.debevec.org/HDRShop/main-pages/intro.htmlLDRHDRLDR vs HDR•Source http://www.debevec.org/HDRShop/main-pages/intro.htmlLDR at 1/64th orig brightnessHDR at 1/64th orig brightnessLDR vs HDR•Source http://www.debevec.org/HDRShop/main-pages/intro.htmlLDR at 32 times orig brightness HDR at 32 times orig brightnessCreating the following scene.Create The objects•In modeler:–Create tab•Objects –Toroid (press Ok)–Press Tab key (subpatch)–Press “Q” and name the toroid surface “toroid”Create The objects•On a new layer create the box–Create tab•Objects –Toroid (press Ok)–Press Tab key (subpatch)–Press “Q” and name the box surface “box”Send the objects to Layout•Position the camera as in the screen belowSet up the Scene for the HDRR•1. Click the “Image Editor” button–2. Load your HDR image and close the image editor window•1. Scene Tab–2. Click “Backdrop button”•Effects window–3. Add Environment dropdown menu•Image World–4. Make sure the image world is highlighted–5. Click edit, and select properties.–Where it says Light Probe Image select the HDR image you loaded.–Close effects windowSetting up HDR lighting•1. Open up the light properties window–2. uncheck “Affect Diffuse”’–3. click “Global Illumination” button4. Global Illumination window5. Set ambient intensity to 0%6. check “Enable Radiosity” and “Noise reduction” and set type “backdrop only”7. intensity set to 50 %Set surface texture•1. Open “surface editor”•2. Select the Toroid surface•3 .Apply the Brass preset texture4. Open render options window 5. turn on shadows and reflections and refractions.Render the Scene!!(steps not included)?Questions?resources•HDR images and
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