Digital Art Zone

 
   
2 of 3
2
DS Atmospheric Effects cameras - question
Posted: 05 April 2013 01:57 PM   [ Ignore ]   [ # 16 ]
Power Member
Avatar
RankRankRank
Total Posts:  1551
Joined  2003-10-09

So just out of curiosity, why are there “camera shaders” and not just shaders?  Do they need to know the position of the camera to determine the density of the effect, or is it just easier or more effective to somehow tie it to the camera rather than being a volume shader of some kind?

Profile
 
 
Posted: 05 April 2013 01:58 PM   [ Ignore ]   [ # 17 ]
Power Member
RankRankRank
Total Posts:  2322
Joined  2011-11-16

You misunderstand the concept of shaders. Sorry, tired atm so can’t explain further.. hopefully someone else can, or I will later.

As a short… shaders don’t just apply to laying down color, specularity information, they refer to pretty much anything in regards to light interaction in the scene. Thus, cameras fall into this pervue.

 Signature 

Just because I may have a strong opinion doesn’t make it any more (or less) correct than any other, just that I feel passionately a particular way at that moment.

Profile
 
 
Posted: 05 April 2013 04:57 PM   [ Ignore ]   [ # 18 ]
Member
Avatar
Rank
Total Posts:  134
Joined  2003-10-09
Gedd - 05 April 2013 01:58 PM

You misunderstand the concept of shaders. Sorry, tired atm so can’t explain further.. hopefully someone else can, or I will later.

As a short… shaders don’t just apply to laying down color, specularity information, they refer to pretty much anything in regards to light interaction in the scene. Thus, cameras fall into this pervue.

Thanks for that tid bit Gedd. I hope you come back and explain shaders a little more grin

Profile
 
 
Posted: 05 April 2013 11:50 PM   [ Ignore ]   [ # 19 ]
Addict
Avatar
RankRankRankRank
Total Posts:  4306
Joined  2011-11-25

I admit I am having trouble understanding the volume camera. I can figure out the fog, and the other cameras but the tutorial I guess isn’t clear to me how to set up a scene, it just seems to say what features the cameras have… Is there a tutorial that shows how to set up a scene from scratch so I may understand better the volume camera and how the cones of light are generated?

I like what the other artists have done to make a spotlight shine down, that is what I’m trying to do from a window.  The tutorial says the cone effect is part of the camera but I admit I don’t understand.

All help is appreciated.

Thanks!

Profile
 
 
Posted: 06 April 2013 12:52 AM   [ Ignore ]   [ # 20 ]
Member
Avatar
Rank
Total Posts:  150
Joined  2007-03-03

i was surprised to learn that shaders can apply to cameras too - i thought they only applied to textures / materials on objects.  i would appreciate a tutorial that goes in depth on this too.

as for getting the cone of light (known as god rays) this is achieved by turning up the light volume dial in the volume setting of the volume camera, but for it to be visible you have to turn down (or off) any distant lights, as the light from them are also amplified, and will flood the image.  you can alter the cone shape by adjusting the spread angle of your spotlight.

these cameras with shaders are not “instant image” creators (though there are a set of presets you can use), but a tool that gives very good atmospheric effects that render relatively quickly.  they are adjustable, so you have a great deal of control, and you will have to experiment quite a bit to learn how to get the exacy effect you want - but thats all part of the fun.  sometimes you can get a surprise by randomly altering the parameters.

i’m still learning, and would love to see a tutorial, as the guide is pretty short and doesnt go into the tool in full depth.

but all in all, this is one of the best tools i have bought.

Profile
 
 
Posted: 06 April 2013 08:09 AM   [ Ignore ]   [ # 21 ]
Addict
Avatar
RankRankRankRank
Total Posts:  4306
Joined  2011-11-25
nightkin - 06 April 2013 12:52 AM

i was surprised to learn that shaders can apply to cameras too - i thought they only applied to textures / materials on objects.  i would appreciate a tutorial that goes in depth on this too.

as for getting the cone of light (known as god rays) this is achieved by turning up the light volume dial in the volume setting of the volume camera, but for it to be visible you have to turn down (or off) any distant lights, as the light from them are also amplified, and will flood the image.  you can alter the cone shape by adjusting the spread angle of your spotlight.

these cameras with shaders are not “instant image” creators (though there are a set of presets you can use), but a tool that gives very good atmospheric effects that render relatively quickly.  they are adjustable, so you have a great deal of control, and you will have to experiment quite a bit to learn how to get the exacy effect you want - but thats all part of the fun.  sometimes you can get a surprise by randomly altering the parameters.

i’m still learning, and would love to see a tutorial, as the guide is pretty short and doesnt go into the tool in full depth.

but all in all, this is one of the best tools i have bought.

Thanks Nightkin. I will try this tonight when I have time. I admit lighting isn’t my strong suit, but I saw the nice images in this thread and wanted to check it out. I think the purchase is worth it alone for the fog camera, however, I like to be able to understand a bit more how to achieve the nice effects. =-)

Profile
 
 
Posted: 06 April 2013 11:01 AM   [ Ignore ]   [ # 22 ]
Member
Avatar
Rank
Total Posts:  134
Joined  2003-10-09
SereneNight - 05 April 2013 11:50 PM

I admit I am having trouble understanding the volume camera. I can figure out the fog, and the other cameras but the tutorial I guess isn’t clear to me how to set up a scene, it just seems to say what features the cameras have… Is there a tutorial that shows how to set up a scene from scratch so I may understand better the volume camera and how the cones of light are generated?

I like what the other artists have done to make a spotlight shine down, that is what I’m trying to do from a window.  The tutorial says the cone effect is part of the camera but I admit I don’t understand.

All help is appreciated.

Thanks!

Totally agree. Love the tool, but the tutorial is lacking and a bit confusing.

Profile
 
 
Posted: 07 April 2013 03:07 PM   [ Ignore ]   [ # 23 ]
Member
Avatar
Rank
Total Posts:  150
Joined  2007-03-03

this is a nice simple set to show how to get the god rays from the volume camera.  I have loaded a simple cyclorama backdrop (but even a vertical wall would do)  and created a primitive plane for a reflective floor.  I loaded genesis with a female shape, and a few clothes, then chose a nice pose.  the only lights in the scene are two spotlights - one above Genesis and slightly to one side, then angled downwards.  I viewed the scene through the spotlight, and then rotated and zoomed to get the light pointing where i wanted.  I made the angle quite narrow, and made the light fairly intense.

the other spotlight is on the floor and angled upwards , with a low intensity and tinted so as to simulate light reflected from the shiny floor.

Now for the camera.  I loaded the Volume camera, set the light density pretty high (.0046), and set the volume density at .0021.  I also set the quality high, because otherwise it will look somewhat grainy.  I set the cameras color to yellow - but thats just a matter of personal choice.

if you follow those steps, you should get the same effects.  if there is too much light, try reducing the intensity of the spots.

Image Attachments
pose.jpg
Profile
 
 
Posted: 07 April 2013 04:10 PM   [ Ignore ]   [ # 24 ]
Active Member
RankRank
Total Posts:  284
Joined  2012-02-12
nightkin - 07 April 2013 03:07 PM

this is a nice simple set to show how to get the god rays from the volume camera.  I have loaded a simple cyclorama backdrop (but even a vertical wall would do)  and created a primitive plane for a reflective floor.  I loaded genesis with a female shape, and a few clothes, then chose a nice pose.  the only lights in the scene are two spotlights - one above Genesis and slightly to one side, then angled downwards.  I viewed the scene through the spotlight, and then rotated and zoomed to get the light pointing where i wanted.  I made the angle quite narrow, and made the light fairly intense.

the other spotlight is on the floor and angled upwards , with a low intensity and tinted so as to simulate light reflected from the shiny floor.

Now for the camera.  I loaded the Volume camera, set the light density pretty high (.0046), and set the volume density at .0021.  I also set the quality high, because otherwise it will look somewhat grainy.  I set the cameras color to yellow - but thats just a matter of personal choice.

if you follow those steps, you should get the same effects.  if there is too much light, try reducing the intensity of the spots.

That’s a great tutorial - thanks!

Profile
 
 
Posted: 09 April 2013 11:58 AM   [ Ignore ]   [ # 25 ]
Power Member
Avatar
RankRankRank
Total Posts:  2315
Joined  2012-02-04

Act quickly! AoA Atmospheric Effects is on sale at a super price.

Image Attachments
AoA_Atmosphereic.JPG
Profile
 
 
Posted: 09 April 2013 12:02 PM   [ Ignore ]   [ # 26 ]
Addict
Avatar
RankRankRankRank
Total Posts:  11246
Joined  2007-11-06

...definitely worth every penny.

 Signature 

...it’s five minutes to midnight…

I’d rather have a blue sky above me than a blue screen in front of me.

Profile
 
 
Posted: 09 April 2013 02:27 PM   [ Ignore ]   [ # 27 ]
Member
Avatar
Rank
Total Posts:  150
Joined  2007-03-03

it even works in cartoon mode.  i was surprised by that myself.

Image Attachments
shower_toon.jpg
Profile
 
 
Posted: 09 April 2013 03:14 PM   [ Ignore ]   [ # 28 ]
Power Member
Avatar
RankRankRank
Total Posts:  1470
Joined  2011-11-16
barbult - 09 April 2013 11:58 AM

Act quickly! AoA Atmospheric Effects is on sale at a super price.

When I went to the page, it said $8.97, not $4.49.

Profile
 
 
Posted: 09 April 2013 03:32 PM   [ Ignore ]   [ # 29 ]
Power Member
Avatar
RankRankRank
Total Posts:  2315
Joined  2012-02-04

Still shows $4.49 for me. I am a PC member. Don’t know if that matters, since this is not a DAZ original.

Profile
 
 
Posted: 09 April 2013 03:38 PM   [ Ignore ]   [ # 30 ]
Power Member
Avatar
RankRankRank
Total Posts:  1470
Joined  2011-11-16
barbult - 09 April 2013 03:32 PM

Still shows $4.49 for me. I am a PC member. Don’t know if that matters, since this is not a DAZ original.

I would say, being a PC is the reason. I’m not a PC member.

Profile
 
 
   
2 of 3
2