Away3D Forum HDRI lighting

HDRI lighting Software: Away3D 4.x

_kihu, Jr. Member Posted: 02 January 2013 03:20 PM Total Posts: 43 Hey, I’m trying to find the best quality for lighting a scene in Away3d. I’ve learned that in 3D Studio Max it is common to use Image Based Global Lighting technique (http://en.wikipedia.org/wiki/Image-based_lighting). I’ve looked for this kind of solution in Away3D and found this: http://www.derschmale.com/2009/01/13/hdr-lighting-in-fp10-away3d/ Notice that the demo is almost 4 years old! I guess I can re-write this in Away3D 4.0 but I’m wondering why this technique is so unpopular. Would it be better to go with the light probes solution (http://www.derschmale.com/2011/12/27/convolution-light-probes-in-away3d-4-0/)? What solutions you think are the best?
_kihu, Jr. Member Posted: 03 January 2013 10:44 AM Total Posts: 43 [ # 1 ] I’ve found out that the current class for doing this is called EnvMapAmbientMethod, but for the life of me I can’t get it to work. Here’s some code: cubeTexture = new BitmapCubeTexture(Cast.bitmapData(EnvPosX), Cast.bitmapData(EnvNegX), Cast.bitmapData(EnvPosY), Cast.bitmapData(EnvNegY), Cast.bitmapData(EnvPosZ), Cast.bitmapData(EnvNegZ)); var bd:BitmapData = new BitmapData(4, 4, false, 0xffffff); mat = new TextureMaterial(new BitmapTexture(bd)); var amb:EnvMapAmbientMethod = new EnvMapAmbientMethod(cubeTexture); mat.ambientMethod = amb; scene.addChild(new SkyBox(cubeTexture)); sphere = new Mesh(new SphereGeometry(150, 40, 20), mat); sphere.x = 300; sphere.y = 160; sphere.z = 300; scene.addChild(sphere); The final result is a black sphere. EnvMapMethod works in the same setup.
_kihu, Jr. Member Posted: 04 January 2013 10:51 AM Total Posts: 43 [ # 2 ] Since EnvMapAmbientMethod renders only black I got back to Light Probes and encountered a problem. In example: https://github.com/away3d/away3d-examples-fp11/blob/master/src/Intermediate_LightProbes.as I removed mainLight and changed headMaterial’s light sources to probes `headMaterial.lightPicker = new StaticLightPicker([lightProbeFL, lightProbeFR, lightProbeNL, lightProbeNR]); headMaterial.diffuseLightSources = LightSources.PROBES; headMaterial.specularLightSources = LightSources.PROBES;` This ended with error: at RegisterPool/requestFreeVectorReg() [RegisterPool.as:46] [Fault] exception, information=Error: Register overflow!
_kihu, Jr. Member Posted: 04 January 2013 11:54 AM Total Posts: 43 [ # 3 ] Ok, so it worked:) I’ve removed one of the probes from the lightpicker. I’ve brought back the mainLight into the lightpicker, but I set it’s ambient, specular and diffuse to zero, so it doesn’t interfere with probe lights. I’ve added specularMaps to the remaining 3 probes (just generated white BitmapData sized 256,256). I’m still to learn if the number of probes limitation is gpu-specific or if there’s some other reason.

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