MR Shaders: A+D: Problem with Cutout & Environment

nisus · February 26th, 2007

Hi All,

I've made an A+D material with a bitmap placed in the cutout slot. The transparency renders correctly.
When I add a bitmap in the environment slot, the environment map shows up where the object should be transparent... i.e. no transparancy gets calculated anymore.

How can I solve this problem?

rgds,

nisus

daniohayon · February 26th, 2007

Quote:

Originally Posted by nisus

i.e. no transparancy gets calculated anymore.

Actually it is calculated, but since there is an image in the environment you end up seeing it through the transparent areas.

What are you trying to achieve?

nisus · February 26th, 2007

I try to achieve a 'real' cutout, i.e. nothing visible in the cutout or a 'real' transparency.

rgds?

nisus

daniohayon · February 26th, 2007

Quote:

Originally Posted by nisus

rgds?

What the hell...I've just found out what is "RTFM" and now you give me this...

I understand what you're trying to do, but why would you add a map in the Env slot? That's asking MR to add that map to the transparent areas.

Are you trying to get reflections with thet map?

nisus · February 26th, 2007

ow ow ow... First of all... RTFM = NOT the same as 'rgds', the latter only meaning "regards"...

Other than that, I assume you did NOT assume I had to RTFM first... ,-p

BacK to the topic...

It's so simple... I'm trying to make a metal plate with holes in it...
Metal as in 'reflection/environment', holes as in 'cut out'...
Because I am using a background image, I need an environment because otherwise I get 'wrong' (read: screen mapped) reflections... To get the holes, I need a cutout map...

I'm not sure if you understood my previous explanation well, but I'm NOT trying to make a reflection in the 'holes'... I AM howevert trying to make a reflection on the whole plate, except in the holes... For some reason, the latter doesn't work...

so I'm asking for any help... (and believe me, there is nothing written about this in the manual...)

rgds,

nisus

daniohayon · February 26th, 2007

This is a problem. MR is very weird about the Env map. It will show it through anything reflective. I've masking almost everything with the holes map...Nothing!

If you place a different map in the material Env slot, you will get reflections on the material and the actual map (as Env) through the holes. You can't escape this. Let me know if you do...

Few months ago I had the same problem with my Env map, it was reflecting as if you could see the map through the wood floor (interior scene). Posting it in the forum got me adding the map in Photoshop, and leaving the environment map empty. Not the best...

Justin Hunt · February 26th, 2007

Drop a MRPhysical sky shader into the environment slot and the bitmap into the custom bitmap slot

You will have to play with the settings to get the reflections right

JHV

nisus · February 27th, 2007

Tnx, this is a great help! ,-)

nisus

daniohayon · February 27th, 2007

After few experiments, dropped the same global Env map into the mr sky and it worked. way to go Justin! Sorry I couldn’t help you more nisus

nisus · February 28th, 2007

Quote:

Sorry I couldn’t help you more nisus

Hey, no prob at all, your day will come! I'm very happy to see that you tried out some things ,-) I have a good feeling about growing a strong MR-forum here on CGA... Good to see more interest, more hands and more brains ,-)

nisus

February 26th, 2007	#1 (permalink)
nisus Super Moderator Join Date: Mar 2002 Location: Gent Flanders Belgium Europe Age: 32 Posts: 3,276 Name: Evert Vandenberghe	MR Shaders: A+D: Problem with Cutout & Environment Hi All, I've made an A+D material with a bitmap placed in the cutout slot. The transparency renders correctly. When I add a bitmap in the environment slot, the environment map shows up where the object should be transparent... i.e. no transparancy gets calculated anymore. How can I solve this problem? rgds, nisus __________________ www.ams.be / www.nisusarts.com http://www.youtube.com/profile_videos?user=nisusCGA&p=r

February 26th, 2007	#3 (permalink)
nisus Super Moderator Join Date: Mar 2002 Location: Gent Flanders Belgium Europe Age: 32 Posts: 3,276 Name: Evert Vandenberghe	Re: A+D: Problem with Cutout & Environment I try to achieve a 'real' cutout, i.e. nothing visible in the cutout or a 'real' transparency. rgds? nisus __________________ www.ams.be / www.nisusarts.com http://www.youtube.com/profile_videos?user=nisusCGA&p=r

February 26th, 2007	#5 (permalink)
nisus Super Moderator Join Date: Mar 2002 Location: Gent Flanders Belgium Europe Age: 32 Posts: 3,276 Name: Evert Vandenberghe	Re: A+D: Problem with Cutout & Environment ow ow ow... First of all... RTFM = NOT the same as 'rgds', the latter only meaning "regards"... Other than that, I assume you did NOT assume I had to RTFM first... ,-p BacK to the topic... It's so simple... I'm trying to make a metal plate with holes in it... Metal as in 'reflection/environment', holes as in 'cut out'... Because I am using a background image, I need an environment because otherwise I get 'wrong' (read: screen mapped) reflections... To get the holes, I need a cutout map... I'm not sure if you understood my previous explanation well, but I'm NOT trying to make a reflection in the 'holes'... I AM howevert trying to make a reflection on the whole plate, except in the holes... For some reason, the latter doesn't work... so I'm asking for any help... (and believe me, there is nothing written about this in the manual...) rgds, nisus __________________ www.ams.be / www.nisusarts.com http://www.youtube.com/profile_videos?user=nisusCGA&p=r

February 26th, 2007	#6 (permalink)
daniohayon Senior Member Join Date: Sep 2006 Location: New York Posts: 124 Name: Dani Ohayon	Re: A+D: Problem with Cutout & Environment This is a problem. MR is very weird about the Env map. It will show it through anything reflective. I've masking almost everything with the holes map...Nothing! If you place a different map in the material Env slot, you will get reflections on the material and the actual map (as Env) through the holes. You can't escape this. Let me know if you do... Few months ago I had the same problem with my Env map, it was reflecting as if you could see the map through the wood floor (interior scene). Posting it in the forum got me adding the map in Photoshop, and leaving the environment map empty. Not the best... __________________ Homer Simpson: Facts are meaningless. You could use facts to prove anything that's even remotely true!

February 27th, 2007	#8 (permalink)
nisus Super Moderator Join Date: Mar 2002 Location: Gent Flanders Belgium Europe Age: 32 Posts: 3,276 Name: Evert Vandenberghe	Re: A+D: Problem with Cutout & Environment Tnx, this is a great help! ,-) nisus __________________ www.ams.be / www.nisusarts.com http://www.youtube.com/profile_videos?user=nisusCGA&p=r

February 27th, 2007	#9 (permalink)
daniohayon Senior Member Join Date: Sep 2006 Location: New York Posts: 124 Name: Dani Ohayon	Re: A+D: Problem with Cutout & Environment After few experiments, dropped the same global Env map into the mr sky and it worked. way to go Justin! Sorry I couldn’t help you more nisus __________________ Homer Simpson: Facts are meaningless. You could use facts to prove anything that's even remotely true!

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