- Luxcore bump + smoothing
- Cycles (this is how it supposed to look)
- Luxcore bump flat
- Luxcore smoothing, no bump
Weird behaviour of bump
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Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Weird behaviour of bump
I seems to me like bump does not work well with Phong (or whatever it is) smoothing.
CPU Bidir + Metropolis | Core i5-4570
Re: Weird behaviour of bump
Please upload the scene (if possible with all textures and HDRI, or link to it).
Re: Weird behaviour of bump
texture: https://cc0textures.com/post/170225601756/fabric-02
hdri: https://hdrihaven.com/hdri/?h=green_point_park
Object on the image is at layer 3. Material is "plane", it has both luxcore and cycles nodes.
- Attachments
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- bump-test.blend
- (805.51 KiB) Downloaded 186 times
CPU Bidir + Metropolis | Core i5-4570
Re: Weird behaviour of bump
Maybe you can describe in more detail what you think is wrong?
Do you mean that the shadowed areas are brighter?
Some observations:
You are using a texture with a very fine pattern.
This produces the moiré effect we see in the foreground and at some distance to the camera, the individual elements of the fabric are so small that they effectively become noise.
Do you mean that the shadowed areas are brighter?
Some observations:
You are using a texture with a very fine pattern.
This produces the moiré effect we see in the foreground and at some distance to the camera, the individual elements of the fabric are so small that they effectively become noise.
Re: Weird behaviour of bump
Of couse it produce moire pattern, but that's wrong pattern.B.Y.O.B. wrote: ↑Wed Aug 15, 2018 9:02 pm Maybe you can describe in more detail what you think is wrong?
Do you mean that the shadowed areas are brighter?
Some observations:
You are using a texture with a very fine pattern.
This produces the moiré effect we see in the foreground and at some distance to the camera, the individual elements of the fabric are so small that they effectively become noise.
On the other hand, nevermind. It should be that "terminator problem". If I get it right, luxcore has problem casting correct shadows over smoothed (Phong interpolated?) polygons at terminator.
Bump, solid color: No bump, color texture:
CPU Bidir + Metropolis | Core i5-4570
- FarbigeWelt
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Re: Weird behaviour of bump
How deep resp. high is your bump? It looks like it throws shadows causing what you think is wrong.
Light and Word designing Creator - www.farbigewelt.ch - aka quantenkristall || #luxcorerender
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Re: Weird behaviour of bump
How what?FarbigeWelt wrote: ↑Thu Aug 16, 2018 5:58 am How deep resp. high is your bump? It looks like it throws shadows causing what you think is wrong.
If you're asking me about "bump height" – this parameter is so unrelated to anything, I don't want even talk about that. It should either be made meaningful, or thrown out.
In t-shirt picture it's normal map with height 1.0.
CPU Bidir + Metropolis | Core i5-4570
Re: Weird behaviour of bump
In your first post, I don't see any terminator issues at all.
If you plug any texture apart from the normal map into the bump slot, the grayscale values are interpreted as elevation, where 1.0 (white) is 1 meter and 0.0 (black) is 0 meter (or something like that, maybe the 0 m is gray, not sure about that).
Anyway, it's an absolute value. That's why you usually have to scale it down, you can use a math/multiply node for this or the bump node (they are the same internally).
From the absolute height passed by the bump texture, the shading normal is then computed.
Now, normalmaps are something different, they directly contain the shading normal.
Their height parameter is a relative one, with 1.0 meaning "just use the shading normal as it is in the normal map" and any other value scales the height (0.5 is "make the height appear half as strong as baked into the normal map").
Re: Weird behaviour of bump
If you're not sure, how should I be?
I've already get the idea, that normal map is something usable.
This is cycles image: I've just plugged this map:
http://www.bricksntiles.com/textures/ma ... mp-map.jpg
Everything I've got with luxcore bump is either ugly or very ugly, I won't attach the images.
But you may have the scene. HDRI is the same. P.S. About white being 1 meter and grey being zero or something – these are all words, it (maybe) supposed to be like this, but what I see is something else. It'd be great if there was some convincing images. Made to scale.
CPU Bidir + Metropolis | Core i5-4570