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Post by rjeff // Sep 21, 2008, 12:33pm
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rjeff
Total Posts: 1260
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Ok I hope I can get somebody to help me out with this. I have been experimenting with HDRI. However no matter what I do I seemt to get multiple light sources. Want I hope I can get somebody to do is to let me have a HDRI map that they know they are getting one source from and see if I can get one light source from it. This way I can know if it is me or my maps. So does anybody have a good light map I can have, and then help me with it if need be? I really appreciate it. Because you may also be helping others as well. |
Post by TheWickedWitchOfTheWeb // Sep 21, 2008, 1:06pm
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TheWickedWitchOfTheWeb
Total Posts: 858
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Correct me if I'm wrong, but the whole point of HDRI lighting is to have the HDRI pic acting as a light source, not just one point of it. Think of it as a skydome that emits light. Depending on how many samples you've got set the results will be harsher/smother accordingly.
If you only want one light source, then use the HDRI map for reflection only, like the old Environment Map type of thing, and use regular light(s). |
Post by rjeff // Sep 21, 2008, 1:37pm
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rjeff
Total Posts: 1260
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Well here is how I use it. This may be wrong. I turn on GI and chose an HDRI image. When I render I get shadows from all sides. I want it more like sunlight where you have one directional shadow. |
Post by robert // Sep 21, 2008, 1:56pm
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robert
Total Posts: 609
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Did you delete the lights in the scene? If you don't they still have an effect when rendering even if they aren't included in the GI calculations.
Or check these maps out at {E}vermotion (http://www.evermotion.org/index.php?unfold_exclusive=84&unfold=exclusive).
If you don't like those I got 715mb of HDRI maps that I managed to find free on the internet:p, I'm sure we could find one that suits your needs.:D |
Post by rjeff // Sep 21, 2008, 2:22pm
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rjeff
Total Posts: 1260
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yup..just the one GI going on. |
Post by robert // Sep 21, 2008, 2:56pm
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robert
Total Posts: 609
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What's your number of samples? Also what did you set the quality to? Did you check the Global Illumination check box? Maybe even go to the GI tab and check your settings, provide a screen grab, if possible, of your settings. |
Post by TheWickedWitchOfTheWeb // Sep 21, 2008, 3:00pm
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TheWickedWitchOfTheWeb
Total Posts: 858
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Don't know whether you're using HDRI in Model side or Vray in workspace so I'll generalise! Make sure that it's set to use the HDRI map only, not HDRI plus any lights you may have. Make sure that the HDRI samples are high enough (at least 100). Nextly, check your HDRI map/image. If it's a big bright all over thing then you're going to get light from every angle. Try different maps to see the difference (there's a truck load of freebies out on the interweb, just search for 'free hdri maps' or a variant thereof for more than you can shake a stick at).
Hope that's some help. |
Post by transient // Sep 21, 2008, 3:52pm
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transient
Total Posts: 977
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Change the environment shadows type to map (right clicking on the Envir. shadows icon brings up the panel). I think the new ibl light in lightworks creates multiple lights according to the map, so if the shadow type is set to raytraced then the shadows will be hard. |
Post by rjeff // Sep 21, 2008, 3:59pm
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rjeff
Total Posts: 1260
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Ok here is a screen grab. This is using only HDRI. See how you have all the different light sources making many shadows. Now the place where I got this map from uses Vray with 3d Studios. I am using LW. I do have dribble..just not on this cpu. But LW should have better results than this right? |
Post by robert // Sep 21, 2008, 4:24pm
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robert
Total Posts: 609
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I notice your environment type is set to probe, is the map a probe map, like it's a reflective ball in the middle of a black background? If not that may be a problem, but I'm not sure.
Where did you get the map? I wanna see if I can get that issue then resolve it. |
Post by noko // Sep 21, 2008, 5:54pm
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noko
Total Posts: 684
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Some HDRI's will have what appears to be multiple light sources due to lens artifacts like lens flare which would create multiple light points on the HDRI. More or less limitation of technique used to capture the original HDRI.
One trick which can be used is to use HDRI to light your scene but use two identical regular casting lights, one with shadows on (shadow map or raytrace), the other with opposite intensity and shadowing turned off. This will cast a shadow but not light you scene, virtually anywhere you like to have shadows. HDRI course shows how this can be done which can be found in the later chapters using regular lights with HDRI. This technique is for situations like this. Turning the bridge off when you have a dual set of lights to cast only shadows while the HDRI lights your scene helps. Plus this dramatically decreases render time needed and gives much greater control over shadowing and composition of your scene.
Hope this helps. |
Post by transient // Sep 21, 2008, 6:19pm
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transient
Total Posts: 977
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[Double Post] |
Post by transient // Sep 21, 2008, 6:20pm
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transient
Total Posts: 977
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Your settings seem okay, so I think maybe it's just lightworks not liking your ibl. Unless I test it myself I can't be sure, but unfortunately I don't see a workaround for this (except what noko just said).
Most probes I use with lightworks are fine. |
Post by rjeff // Sep 22, 2008, 2:20am
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rjeff
Total Posts: 1260
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http://www.aversis.be/hdri/index.htm This is the place I got, however this file is not on there. So I uploaded to here. |
Post by TheWickedWitchOfTheWeb // Sep 22, 2008, 3:00am
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TheWickedWitchOfTheWeb
Total Posts: 858
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Using your HDRI probe and settings I'm getting a different result. I've attached the scene if you want to have a look and see if you can see anything different.
15323
15324 |
Post by rjeff // Sep 22, 2008, 3:16am
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rjeff
Total Posts: 1260
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That is odd..hmm I will have a go at that when I get home from work. Thanks. |
Post by rjeff // Sep 22, 2008, 7:47am
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rjeff
Total Posts: 1260
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It seems that if I use the Probe over detect settings I get different shadows. Detect seems to work better. |
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