bumpmap & skylight

[flipside]

Is it normal that you cannot see a bump effect when using only skylight for lighting?

here's n example:

with direct & skylight together:


with only skylight:

[suurland]

Yes

/Thomas

[GoncaloP]

Yes, I think so! And its good in this way, just try to use Vraydisplacement and youl will see the difference in render time with the irradiance map calculation.

Gonçalo

[3dform]

the real problem is:
it would need a much higher sampling and therefor produce more flickering.

robert

[vlado]

You need some diversity in the skylight color in order to make the bump visible - make one part of the sky darker than the other, for example, or simply add some objects to the scene to block the skylight in certain directions. This is because the geometry is, after all, flat; if the skylight is uniform from all directions there is nothing that would make the bump map visible.

Here are some examples:

uniform skylight: bump is not visible


non-uniform skylight (checker map), some bump is visible


uniform skylight with another object in the scene, bump is clearly visible



Best regards,
Vlado

[flipside]

Hey thanks!

[perazdera]

bumpmap & skylight

Try using Comosite Map with two different HDR images for environment.

It gives dramatic improvement in rendering bump maps.

Experiment

Regards

Pera Zdera



[/img]

[flipside]

Hi, your experiment doesn't show up here.

regards,

flipside

[Nenad]

Same here ...

Regards,

Nenad

[vlado]

Which experiment? I can post the scene as well, if you want to check it out...

Best regards,
Vlado

[perazdera]

There was slight misunderstanding.

When I said experiment I was thinking that one has to experiment and to some tweaking with different settings (multiplier etc.) for HDRi images which constitute Composite map.

I didn;t plan to post images because I don;t have permanent web space. I'll try to put images now. ometimes they will be on... but sometimes off.

Environment with Comoposite map



Environment with simple HDR image:



Material Editor screen grab:



I used override of MAX environment setting in VRay render dialog

Hope it works now

perazdera

[pengo]

2 perazdera

I can see only a red X

please change the link

I'd like to see your tests

bye and thanks

[Syclone1]

Hey Pengo, as perazdera said in the post prior to yours:

"I didn;t plan to post images because I don;t have permanent web space. I'll try to put images now. ometimes they will be on... but sometimes off."

-dave