Hi,I am testing HDR for my engine these days. I tried to add a very bright directional light to the scene ,whitch is 10 times brighter than normal LDR light. It looks good after ToneMaping,except the translucent objects....
Because some translucent objects don`t need to be illuminated,they simply output the LDR color of source texture.So after ToneMapping they became very dark. I solved this problem by rendering them after ToneMapping,but another problem is the water reflection. I need to render scene again to create the reflection map,but the water must be rendered before ToneMaping,so the reflection of translucent objects still become very dark...
I don't very clear about how to combine the HDR and alpha blend effects.Do I need to increase their brightness when doing water reflection?
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HDR and translucent objects,and water reflection....
Started by dragon.R, Oct 20 2012 12:01 AM
2 replies to this topic
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Posted 20 October 2012 - 01:25 PM
If you want your transparent geometry to fit in with your HDR scene, you need to light them properly with the same overall lighting intensity that you use for your opaques. You can't just composite them in afterwards with LDR lighting. If you have emissive geometry that generates its own lighting, then you need to be able to set an HDR intensity value so that it will fit in with the scene.
#3 Members - Reputation: 202
Posted 21 October 2012 - 08:34 PM
If you want your transparent geometry to fit in with your HDR scene, you need to light them properly with the same overall lighting intensity that you use for your opaques. You can't just composite them in afterwards with LDR lighting. If you have emissive geometry that generates its own lighting, then you need to be able to set an HDR intensity value so that it will fit in with the scene.
Thanks.Do you mean I should set a parameter to scale the emissive color? I wonder if it works everywhere in the scenes which have large brightness range. Maybe using the exposure of last frame will be better?
