sun - shadow study

[proces2]

looks nice. can you post your settings? i'm curious what you used for skylight and irrad. settings.

[flipside]

Psy, if you use area shadows on a directional light, vray turns the directional light into an area light (sphere or plane), so you'll need to move your lightsource very far away from the model to act as the sun. Otherwise you have non-directional shadows as in your image, with too much blur on them.

flipside

[pengo]

Hi to all

and thanks for the tips !!!

to PSY :
can I know wich kind of shadows did u used to get this soft shadows outline?


Bye and thanks for this great forum

[trixian]

Psy, if you use area shadows on a directional light, vray turns the directional light into an area light (sphere or plane), so you'll need to move your lightsource very far away from the model to act as the sun. Otherwise you have non-directional shadows as in your image, with too much blur on them.

flipside

Isn't the size field (U, V and W) meant for this. Instead of moving the light out far away, can't you just make it smaller?
Could be that the relative size of the scene makes it impossible though, and then the only option would be to move it further away.

[flipside]

But to have directional shadows (=parallel shadow lines) you need to place it far away. The closer you place it, the more the shadows edges diverge from each other. The sun is of course also not a directional light, but because it is so far away, it looks like the shadows are directional. It casts area shadows but only subtle. So If you don't want soft edges for your sun shadows, just use directional light without area shadows and place it as far or as close as you want. But to have a little bit softshadows, use the area shadows option and move your light further away to create directional looking shadows again.

[GoncaloP]

Of topic: For the image used as a skylight just play with

1 : Color mapping vlaue = normal ouput color

means that if you use a color mapping values at 0.025, and need to keep the image at its original color in the environment slot, you will need to increase their output value to 40.

1 : 0.025 = 40

1 is the default exposure for color mapping

Gonçalo

[tom4ski]

Hi,
currently i'm working (fighting) on interior light study animation.
I might be wrong, but it looks to me, that your method works only if the SUN is on. It means, the only dynamic source of light is just sun-standart from viz-daylight system. The skylight in vray is static. There is no light study (or light animation) just with the vray-skylight for example when the day is cloudy, without direct sunlights.

Is there any physically correct method how to produce a skylight during a day in vray?

I fake this effect with vray-lights in the windows and animated multiplier. But this is way off a correct ligth study.

Tomas.

[GoncaloP]

I m currently doing a small test about this, using DreamScape linked to SunlightSystem, I will show it soon

Gonçalo

[J_Bug]

Verry cool guys...

great work, can't wait to see what comes from it

--Jon

[tom4ski]

Gonçalo,
any luck with DreamScape? under the deadline i just ended up with faked solution, combining viz-sunlight-standart + animated color, vray-lights in windows + animated multiplier, and one extra vray-light for hemisphere illumination only with animated multiplier as well.
it would be nice to have an option to animate directly vray skylight next time.

tomas.

[GoncaloP]

look here http://www.chaoticdimension.com/foru...pic.php?t=3288

Gonçalo