Bitmap "Blur = 0.1" vs "Filtering = None"

[Morne]

Hi all

What's the difference between setting the blur to 0 (well 0.1 is lowest it can go), and changing filtering to None?

[AndresAhumada]

Nice quest!!!

Up

[svetlozar.draganov]

When Blur is set to 0.1 3DSmax still filters the image with very small amount while when Filtering is none it doesn't apply any filtering.

[Morne]

:- )
Let me rephrase my question then.
How does each influence render times, the sampler etc, and which one is the "recommended" option?

[Morbid Angel]

sharper texture = longer render time as its more stress on the sampler. But imo it looks better. Blurrier texture is softer and less noise faster render time, but looks blurry. You pick what you need based on time frames and quality you are after.

[vlado]

If you need sharp textures, the elliptical filtering in VRayHDRI might be a better choice, leaving both the filter blur and the filtering setting at their defaults.

Best regards,
Vlado

[jasonhuang1115]

Vlaod, can elliptical filtering be added to V-Ray for maya? I did a quick search and check in Maya's file node, didn't see elliptical filtering as an option there.

[Morne]

If you need sharp textures, the elliptical filtering in VRayHDRI might be a better choice, leaving both the filter blur and the filtering setting at their defaults.

Best regards,
Vlado

How does this affect render times vs just setting blur to 0.1?

[mohammadreza_mohseni]

I have done some test speed wise in 2 version with checker and with real world materials (10 images for each version), and also put the sample rate and raw renders for download in this page.

http://mohseni.info/map-filter-comparison/

1.Bicubic (VRayHDRI)

2.Bilinear (VRayHDRI)

3.Biquadratic (VRayHDRI)

4.Elliptical (VRayHDRI)

5.Pyramidal with Blur:0.01 (3dsMax Standard Bitmap)

6.Pyramidal with Blur: 1.0 (3dsMax Standard Bitmap)

7.None with Blur: 0.01 (3dsMax Standard Bitmap)

8.None with Blur: 1.0 (3dsMax Standard Bitmap)

9.Summed Area with Blur: 1.0 (3dsMax Standard Bitmap)

10.Summed Area with Blur: 0.01 (3dsMax Standard Bitmap)


hope it would helpful for somebody.

regards.

[Morne]

Thanks that is some interesting info!

On the 2nd chart however I think there's a typo, the 1st bar and the last has the same titel?

[mohammadreza_mohseni]

Thanks that is some interesting info!

On the 2nd chart however I think there's a typo, the 1st bar and the last has the same titel?

oh thats a typing issue i will correct it. sorry

[vlado]

Interesting; do you have the images/sample rate heatmap for all the different versions?

Best regards,
Vlado

[super gnu]

so is it correct that using elliptical we should leave the blur at default? does this mean the blur setting has no effect with elliptical? or just that it is not a good idea to reduce it..?

[mohammadreza_mohseni]

Interesting; do you have the images/sample rate heatmap for all the different versions?

Best regards,
Vlado

yes you can download it from here:

http://mohseni.info/wcyf

http://mohseni.info/hdes

these are jpeg.... if you need I can 16 bit png. let me know.

[mohammadreza_mohseni]

so is it correct that using elliptical we should leave the blur at default? does this mean the blur setting has no effect with elliptical? or just that it is not a good idea to reduce it..?

when I have been playing with vrayhdri I have found a parameter that called FilterSharpness but I have test it and there was no visible effect on samplerate map. so I was confused and just test with default of FilterSharpness = 4.0