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There is a problem with the way V-Ray is rendering bump maps. I don't see this issue in Modo or Octane.
As the render resolution is decreased, v-ray's bump seems to "reduce", making the "blurry reflections" look sharper than they should be.
I don't know how other people work, but in modo, we often use the "fit to vfb" feature which reduces the resolution of the image. This causes bumps to look different. If you are tweaking your bump to get a specific "blurry" look from reflections, then start a final full resolution render, your "blurry reflections" will now look much rougher than the smaller "preview" you were looking at while "fit to vfb" was enabled.
This is not an issue with "fit to vfb". You could just do 2 renders (eg. 1 at 200x200, then another at 2000x2000), to see the difference.
Here is the problem in V-Ray. The left image is rendered at 415x415. The right is 1500x1500, then resized to 415x415 in photoshop so we can compare them. You can see the area light reflections on the left look SHARPER than those on the right.
Here is the same test in Octane. While the bump is a bit different to v-ray (I didnt spend much time trying to get an exact match), the important thing to notice is that both left and right look the same. The render resolution does not change the look of the bump/reflections
Here is the same test in MODO. Once again, both left and right look the same. The render resolution does not change the look
This is a problem in v-ray and I would like to get some attention on it. It's very important that what we are seeing while working at a smaller resolution, will translate perfectly to a larger render without changing the look.
I have also attached the test scene
As the render resolution is decreased, v-ray's bump seems to "reduce", making the "blurry reflections" look sharper than they should be.
I don't know how other people work, but in modo, we often use the "fit to vfb" feature which reduces the resolution of the image. This causes bumps to look different. If you are tweaking your bump to get a specific "blurry" look from reflections, then start a final full resolution render, your "blurry reflections" will now look much rougher than the smaller "preview" you were looking at while "fit to vfb" was enabled.
This is not an issue with "fit to vfb". You could just do 2 renders (eg. 1 at 200x200, then another at 2000x2000), to see the difference.
Here is the problem in V-Ray. The left image is rendered at 415x415. The right is 1500x1500, then resized to 415x415 in photoshop so we can compare them. You can see the area light reflections on the left look SHARPER than those on the right.
Here is the same test in Octane. While the bump is a bit different to v-ray (I didnt spend much time trying to get an exact match), the important thing to notice is that both left and right look the same. The render resolution does not change the look of the bump/reflections
Here is the same test in MODO. Once again, both left and right look the same. The render resolution does not change the look
This is a problem in v-ray and I would like to get some attention on it. It's very important that what we are seeing while working at a smaller resolution, will translate perfectly to a larger render without changing the look.
I have also attached the test scene
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