Everything in Bloom

vonHobo

Is there any way to limit bloom to just certain areas, as in the fire coming from the engines in this render?

The first image is without bloom. The second image has bloom applied, and the fire looks nice, but the rest of the image is grainy and that's after an extremely long render compared to the first image, which did not take that long to render at all.

I love bloom but it really slows down my renders and it would be so nice to have it only on specific objects.

 

Linwelly

the trick here is to crank up the emissive of the fire and set the bloom threashold value to 9000, that way the bloom will only catch on to the really bright stuff

vonHobo

Linwelly said:

the trick here is to crank up the emissive of the fire and set the bloom threashold value to 9000, that way the bloom will only catch on to the really bright stuff

Thank you. I will try this today.

I also thought of rendering the ship on a transparent background and then overlaying the planet in Photoshop, but that would not preserve the shadow of the ship on the planet. So not sure that's the way to go. 

Havos

von Hobo said:

Linwelly said:

the trick here is to crank up the emissive of the fire and set the bloom threashold value to 9000, that way the bloom will only catch on to the really bright stuff

Thank you. I will try this today.

I also thought of rendering the ship on a transparent background and then overlaying the planet in Photoshop, but that would not preserve the shadow of the ship on the planet. So not sure that's the way to go. 

Better would be to render the whole image without bloom first, then spot render just the jet engine fires with bloom turned on afterwards (as they are small spot renders they should render very fast). Then combine in photoshop.

vonHobo

Havos said:

von Hobo said:

Linwelly said:

the trick here is to crank up the emissive of the fire and set the bloom threashold value to 9000, that way the bloom will only catch on to the really bright stuff

Thank you. I will try this today.

I also thought of rendering the ship on a transparent background and then overlaying the planet in Photoshop, but that would not preserve the shadow of the ship on the planet. So not sure that's the way to go. 

Better would be to render the whole image without bloom first, then spot render just the jet engine fires with bloom turned on afterwards (as they are small spot renders they should render very fast). Then combine in photoshop.

But wouldn't bloom effect lighting, so the spot renders with bloom may not combine with the larger image to well? For example, you might see a box with lighter color in the spot render when you try to merge with the larger image? 

vonHobo

Solved! Well, best I can do for now.

Increased the Bloom Filter Threshhold from 4,000 to 10,000 and it renders much, much quicker.

Good trick, thank you Linwelly!

The fire still looks great too without any adjustments to emissive.

 

Havos

von Hobo said:

Havos said:

von Hobo said:

Linwelly said:

the trick here is to crank up the emissive of the fire and set the bloom threashold value to 9000, that way the bloom will only catch on to the really bright stuff

Thank you. I will try this today.

I also thought of rendering the ship on a transparent background and then overlaying the planet in Photoshop, but that would not preserve the shadow of the ship on the planet. So not sure that's the way to go. 

Better would be to render the whole image without bloom first, then spot render just the jet engine fires with bloom turned on afterwards (as they are small spot renders they should render very fast). Then combine in photoshop.

But wouldn't bloom effect lighting, so the spot renders with bloom may not combine with the larger image to well? For example, you might see a box with lighter color in the spot render when you try to merge with the larger image? 

Yes, but the further away from the engine the less noticable that would be. You can use a soft brush to delete the edges of any spot render so it will blend into the original image.

vonHobo

Havos said:

von Hobo said:

Havos said:

von Hobo said:

Linwelly said:

the trick here is to crank up the emissive of the fire and set the bloom threashold value to 9000, that way the bloom will only catch on to the really bright stuff

Thank you. I will try this today.

I also thought of rendering the ship on a transparent background and then overlaying the planet in Photoshop, but that would not preserve the shadow of the ship on the planet. So not sure that's the way to go. 

Better would be to render the whole image without bloom first, then spot render just the jet engine fires with bloom turned on afterwards (as they are small spot renders they should render very fast). Then combine in photoshop.

But wouldn't bloom effect lighting, so the spot renders with bloom may not combine with the larger image to well? For example, you might see a box with lighter color in the spot render when you try to merge with the larger image? 

Yes, but the further away from the engine the less noticable that would be. You can use a soft brush to delete the edges of any spot render so it will blend into the original image.

Thank you. I may try that soon here. The render with 10000 bloom threshhold is crystal clear within just under 1 hour. Whereas the render with bloom at 4000 was still going after 6 hours and looked so grainy it was not worth salvaging. Amazing how one setting can make a world of difference.

Linwelly

glad it worked out!

the spot render method might work as well but I would as well be cautious that the tonal differences on the hull and other parts still might show