Re-rendering Glare & Bloom via .exr

[DHawgood]

3dsMax 2018
Corona 1.7

Hi, I was looking for some advice if anyone could be so kind?  I need 2 versions of an animation I have rendered, one with Glare & Bloom and one without (the latter having already been produced).  To do this I.....

• placed a 16:9 plane in a new scene
• added a material (self illumination set to 1.0) + bitmap attached mapping set to screen
• attached the .exr animation sequence to the material & applied it to the plane
• set a camera pointing to the plane
• in Render Settings I turned on Bloom & Glare, set noise level to 1%, turned off motion blur

     

The results were that the Bloom and Glare was successfully calculated when I re-rendered the .exr sequence, however the overall image was soft. So my questions is...

What settings are needed to ensure the re-rendered animation is as sharp as the original?   

Thanks!

[Frood]

Do you have blur at 0,01 in the bitmap node? Should help. But you would always get some blurring from the framebuffer image filter as well. And disabling it affects your B&G result.

I would save out a CShading_BloomGlare pass anyway and comp it over the original footage.


Good Luck

[DHawgood]

Hi,

You're right I've not set the blur yet, I'll see what that does and how it affects things!  I was looking into AA and thinking it was something linked to that instead... I guess it could still be?  Anyway, I'll do a test and see.

Thanks!

[DHawgood]

Blur test @ 0.01

So looking at the test attached, it still seems to be soft, however definitely better.... but still not as sharp as the original. 

[romullus]

Saving separate B&G pass would be safest option, as Frood already noted, but if you really need to render everything out, then place your bitmap in enviroment in enviroment override>direct visibility override, set enviroment to pure white, reset exposure to default, make sure that render output size exactly matches your original image, turn off completely bitmap filtering by setting it to none, turn off image filtering in render setup>system tab by setting it to none. And maybe try to disable antialiasing by setting pass limit to 1.

[sprayer]

why don't you use arionfx for G&B ? It is gives better glare than corona imho

[DHawgood]

Hi romullus,

I really appreciate your help!  I went through and set things exactly as you suggested and it worked perfectly (I've attached an image comparison for anyone interested).  The  suggestion to use the override environment, was that simply to maintain the white surround, or was there another reason I should be aware of?

Thanks!

[DHawgood]

why don't you use arionfx for G&B ? It is gives better glare than corona imho

i wasn't aware of that so thanks!

[romullus]

I really appreciate your help!  I went through and set things exactly as you suggested and it worked perfectly (I've attached an image comparison for anyone interested).  The  suggestion to use the override environment, was that simply to maintain the white surround, or was there another reason I should be aware of?

You're welcome!
Regarding override, yes, you need white enviroment, so you can't place your image here and it's just easier to simply use override slot, than to setup camera, plane and the angle between two :]

why don't you use arionfx for G&B ? It is gives better glare than corona imho

That's a matter of taste, but i prefer Corona's B&G.