shadows, demo

[KKL]

stupid question again, I tried using the Vray light tags on c4d lights, but then shadows automatically jump to hard and it doesn't look too good,

[stefan]

vray has no hard or soft shadow, if you want real area shadow make the ligh tsource bigger. best to always use area lights in vray, they are very fast and produce most realistic results.

also make sure you use real world intensities and a physical camera. if the intensity is too strong you will not see any softness of the shadow(kiek in real)

cheers
stefan

[KKL]

aaah, so it's probably easier to control lights within Vray then,,

thanks, I will go experiment a little! :D

[KKL]

Btw, the physical camera,, when I use it the scene goes dark, lights have to be adjusted (to the degree that the workspace is almost white in light, but the render is dark/grey... I have to uncheck the 'exposure' in PHys,cam to make it correpsond,, but it doesn't really make a difference using it then,,

the manual says it's easier to set up real world illumination and light sources with it (I understand it's easier if you want special things like zooming, focal lens fx's , blurring etc,, but with a 'normal' still image,, does it make a difference?

Could you give an example on how it's 'easier' to set up lights using the phys.cam ?

Thanks! :)

[stefan]

photometric real lights are way brighter than the "usual CG lights" therefore the physical camera is also calibrated.

you have to use stronger lights in that case, that use realworld intensities:-)

leave the exposure checked on!!!! in phycam, otherwise it is no phycam;-)

downlood please all the free files, you see many examples how to use physical camera and lights, materials etc

on our website vrayforc4d.com and our friends site vrayc4d.com

cheers
stefan

[KKL]

Thanks Stefan! my only problem is that the workspace becomes too white to work with, bathed in white light, and I have to turn evetyhing on and off to see anything, but maybe I can find a way around it, like when I use infinite light and turn on sunlight (vray light tag) and phys cam my scene goes black (and the intensity multiplier for phys cam seems to have no effect when I turn it up)
I'll see if I can find some other c4e scene file with a vray sunlight set up that I can take a look at,
thanks again for taking the time to reply! :)

KarenSoroe

[sadece]

why dont you set your workarea as quick-shading or constant-shading instead of gouraund-shading from display menu.

[stefan]

hi KKL

if you have set the lights in a vray typical workflow, the OGL inetrface should not be over bright. this indicates that you have setuo the scene not correct(or you have an unusual scene scale)

use a physical camera with settings you woudl also use in normal world, and also use light values that are used in reality. best to use all photometric lights with real falloff to get best renderqualoty.

then also the viewport will not be overbright:-)

greetings
stefan

[KKL]

Thanks for the advice, I have to admit it feels a little confusing, the phys cam and photometric lights, like learning how to operate a very irrational real life camera, shutter speed and lens shitft etc,, kinda annoying the whole thing, but I'll probably feel different about it when I start understanding the benefits! :), right now it feels more like a weird course in photography than cg rendering, *lol

btw, the interactive render region in c4d doesn't work correctly with Vray, I have to move the frame a little to update it right (or else it goes completely white/black (tried it with both r10 and 11,
I hope this can be fixed in upcoming Vray versions (cause it makes the workflow very slow :(,, but all in all the nice results are very well worth the extra work,

thanks again,

[KKL]

btw, turning on physical cam the lumnosity channel makes every mat black!,, is there a way around that? (I tried reversing/aligning the normals like I read in some other post, but with no luck, (also, working with luminance caused several crashes in Vray when rendering (I have to turn the channels off to render), C4d instantly closes down, and it happens every time, after theh third time I get an error window saying:

"Applicationerror caused my pluing "Vray_MTWrapper.dll!, more information at (file loacation) etc etc"

[stefan]

physical camera uses real world intesities, these are MUCH stronger than the standard lumiocity setting.

simple set the lumiosity multipliuer stronger, so it fits the setting of the phy cam. normally thi sis like 8-55x

then you have right lumiosity according to the physical lights:-)

cheers
stefan

[nycL45]

Real world camera settings for the phy cam here: http://www.forum.vrayforc4d.com/showthread.php?t=2308

Regarding ISO, a.k.a., film speed (how sensitive the film is to light), here: http://www.photonhead.com/beginners/filmspeed.php With film cameras, the higher ISO speeds, 400, 800, resulted in grainy images. That is not an issue with the phy cam.

Leonard