Opacity not casting shadows

Ghori · 19-04-2003, 08:26 AM

Hi,
I've got this problem with Max5, I'm sure it's real easy to fix but I can't get around it.

If I apply an opacity mask to ..lets say a box object it still shows the entire box in the shadow when it should show only the solid areas....

what am I doing wrong?

Ghori

kuman · 19-04-2003, 04:23 PM

try using ray trace shadows instead

that should work out

-k

Ghori · 20-04-2003, 02:26 PM

Still does the same thing even with raytraced shadows!

Ghori · 20-04-2003, 03:37 PM

I figured out why it didn't work> I was using a skylight to cast a shadow....

I could only get it to work when I used a standard ray traced shadow light... sorta sucks...

Is there no other way to get this to work using any other light to achieve a more realistic result?

fabrizzzio · 23-04-2003, 11:23 PM

Shadow map can't cast shadows. Only using raytracing.
Anyway, if you cant with raytracing, maybe u could have a problem in the alpha mapping.

Hope it helps!

Little Nicky · 24-04-2003, 01:21 AM

I don't use Max5, so I don't know, but does the skylight have an option called "Use Opacity Maps"? Becuase it should cast shadows properly otherwise it would be of no use.

And always use Raytraced shadows ... they are slightly slower, but shadow maps are never completely correct, and also can't use filter colours.

fabrizzzio · 24-04-2003, 03:33 PM

the problem with raytracing... is that does not generate soft shadows... like shadow mapping...
Raytracing shadow are very sharp...

You could use area shadows... and if they're no available in your software you can simulate them.
There are a nice tutorial in the tutorial section of 3DTotal about faking area shadows.

Little Nicky · 25-04-2003, 07:07 AM

It can have soft shadows. I can't remember how

but I've done it before.

Jyncus · 25-04-2003, 04:18 PM

Yeah, you can adjust the "shadow spread" ..or whatever its called under the ray traced shadows parameters.
I usually set mine somewhere between 15-20 for creating softer shadows.

Little Nicky · 26-04-2003, 01:06 AM

Thanks Jyncus.

19-04-2003, 08:26 AM	#1
Ghori Registered User Join Date: Apr 2003 Location: Dubai Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts	Opacity not casting shadows Hi, I've got this problem with Max5, I'm sure it's real easy to fix but I can't get around it. If I apply an opacity mask to ..lets say a box object it still shows the entire box in the shadow when it should show only the solid areas.... what am I doing wrong? Ghori __________________ www.ghoridesign.com

20-04-2003, 02:26 PM	#3
Ghori Registered User Join Date: Apr 2003 Location: Dubai Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts	Still does the same thing even with raytraced shadows! __________________ www.ghoridesign.com

20-04-2003, 03:37 PM	#4
Ghori Registered User Join Date: Apr 2003 Location: Dubai Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts	I figured out why it didn't work> I was using a skylight to cast a shadow.... I could only get it to work when I used a standard ray traced shadow light... sorta sucks... Is there no other way to get this to work using any other light to achieve a more realistic result? __________________ www.ghoridesign.com

23-04-2003, 11:23 PM	#5
fabrizzzio The Dr. Gonzo Join Date: Oct 2002 Location: Misiones, Argentina Posts: 182 Thanks: 0 Thanked 0 Times in 0 Posts Awards Showcase Total Awards: 1	Shadow map can't cast shadows. Only using raytracing. Anyway, if you cant with raytracing, maybe u could have a problem in the alpha mapping. Hope it helps! __________________ ----------------------------------------- "Anyone who has never made a mistake has never tried anything new. (Albert Einstein)" ...Croma Studio

24-04-2003, 01:21 AM	#6
Little Nicky PG Rated Join Date: Jan 2003 Location: Levin, New Zealand Posts: 97 Thanks: 0 Thanked 0 Times in 0 Posts	I don't use Max5, so I don't know, but does the skylight have an option called "Use Opacity Maps"? Becuase it should cast shadows properly otherwise it would be of no use. And always use Raytraced shadows ... they are slightly slower, but shadow maps are never completely correct, and also can't use filter colours. __________________ Be Unafraid. Be very Unafraid.

19-04-2003, 04:23 PM	#2
kuman Fishscale Join Date: Oct 2002 Location: Venice Beach Posts: 831 Thanks: 0 Thanked 0 Times in 0 Posts	try using ray trace shadows instead that should work out -k

24-04-2003, 03:33 PM	#7
fabrizzzio The Dr. Gonzo Join Date: Oct 2002 Location: Misiones, Argentina Posts: 182 Thanks: 0 Thanked 0 Times in 0 Posts Awards Showcase Total Awards: 1	the problem with raytracing... is that does not generate soft shadows... like shadow mapping... Raytracing shadow are very sharp... You could use area shadows... and if they're no available in your software you can simulate them. There are a nice tutorial in the tutorial section of 3DTotal about faking area shadows. __________________ ----------------------------------------- "Anyone who has never made a mistake has never tried anything new. (Albert Einstein)" ...Croma Studio

25-04-2003, 07:07 AM	#8
Little Nicky PG Rated Join Date: Jan 2003 Location: Levin, New Zealand Posts: 97 Thanks: 0 Thanked 0 Times in 0 Posts	It can have soft shadows. I can't remember how but I've done it before. __________________ Be Unafraid. Be very Unafraid.

25-04-2003, 04:18 PM	#9
Jyncus mmm..beans. Join Date: Mar 2003 Location: Georgia Posts: 339 Thanks: 0 Thanked 0 Times in 0 Posts	Yeah, you can adjust the "shadow spread" ..or whatever its called under the ray traced shadows parameters. I usually set mine somewhere between 15-20 for creating softer shadows.

26-04-2003, 01:06 AM	#10
Little Nicky PG Rated Join Date: Jan 2003 Location: Levin, New Zealand Posts: 97 Thanks: 0 Thanked 0 Times in 0 Posts	Ahhh, that's the one. Thanks Jyncus. __________________ Be Unafraid. Be very Unafraid.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode