Question lightCache fly

[maya69]

Hey,

i am not sure to understand lightcache fly option

I want outdoor fly building

for calculate lightcache with fly mode i calculate juste for one frame ( with fly option) and after i use licache from the file ?

i see a tutorial in vray doc

he recommande screen mode for outdoor ?

can i calculated lightcache every 5 frama and after use in from file ?

please explain me

best regard

phil

[stefan]

yes, you can set a frame step of 5-10 depending on animation speed.
(in c4d output tab)this saves a lot of time.

cheers
stefan

[maya69]

ok

i speak to lightcache

if i understand

for lightcache

i check fly option

i render each 5 frame lightcache

and after

i use from the file ?

this correct ?

[stefan]

ok:

dont know what you use for second GI, but for LC it goes like:

you setup LC to flythrouh set a save path
you set the frame step in c4d output
you activate "dont render final image2 under vrayoption tab
you render your animation range
you set LC to "from file"
you render final animation withour any frame step

cheers
stefan

[maya69]

ok my english is bad

i try to explain my probleme

i want use lightcache for second ray and for the firt irrmap

my probleme :

i check flyout mode
i check a path save : c:mapmapLC

i set in out option :

0f to 250f and frame set 5 image

i chek no render image

but mapmapLC save only the last frame and not compute all the frame

but if you can post a little capture screen to parametter or a little scene example

this very cool

best regard

[stefan]

the lc chache is only one file.

also the irmap for flythrough(multiframe incremental) is one file.

both you can render in one step.so for 250 frames You render 70 frames (frame step 5). you get 2 files. one for IRMap, one for LC Map.

i definitly have to make a video for this, once you understood it is very easy and fast.

cheers
stefan

[maya69]

i believe understand

i no probleme with irr map
i understand

but if you can make a little video is great

best regard

and i am very sorry for my bad english

best regard

[Rizon Parein]

Yeah yeah video video :)
It is becomming more clear though... but i am sure i am still missing stuff...

anxious to make a vray motiongraphic...

Make my day Stefan ;)

[maya69]

http://www.artvrstudio.com/vray.jpg

he says the preview at the same of image 2

but for me preview at the same of image 1

this normal ?

and i think i make a mistake because the time of calculate a lighcahe for single or fly this the same

best regard

[stefan]

we have a newer system than the one for this tutorial, just make sure you have activated "dont render final image" in vray options tab.

cheers
stefan

[Gecco]

stefan: in the max version as stated on that tutorial we have to calculate the LC for only once for the whole animation if it is set to flythrough which the anim length is set in the preview range of the max timeslider. So you say we have to calculate LC for individual frames in the c4d version, like the IRRmap?

[stefan]

only once yes, only one i cant image, but to be honest i dont know 100%.
are you sure that is said so? lightcache is view dependedn also in max. i think you missunderstood that.

best overall for animation is using IRMap and brute force, faster and easier.
cheers
stefan

[Gecco]

Yes, lc is view dependent, but if you choose flythrough mode and set the active time on the timeline to your anim length the lightcash is calculated along the path of the camera to all frames which is active! At least in max version. That's for sure, i saw that in many tutorial and the official manual too.
However you can of course render lc for each frame but that's expensive.
From the official tut:

The light cache doesn't look bad, but we will need to calculate it for the entire walk-through animation, and not for a single frame only. Note that this is not strictly necessary - we can render the animation with the light cache being calculated each frame; however, rendering it only once will save rendering time, especially for long animations.

1.14. Set the light cache Mode to Fly-through. Make sure that the timeline animation range matches the range which you want to render. This is important because the light cache will look at the current timeline animation range when calculating the fly-through cache.

Since all the light cache samples will be distributed among all the animation frames, we will need to increase the light cache Subdivs value. The exact value depends on the quality you want to achieve and on your specific animation. If the camera moves slowly, or the path is relatively short (e.g. just one room of a house) then you can use lower Subdivs value, since most of the samples will fall in the same place anyways. If the camera moves quickly or covers larger parts of the scene, you will need more samples to get adequate coverage everywhere.

So calculating lc for the entire walkthrough is not yet possible in the c4d version?

[stefan]

i cant say now, if not we will add that, but maybe it dioes already

, but brute force as secondary is the choise of the vray profis here. gies ultra fast. a gi solution i render in a few hours or less wiht brute force.

also you only have to render every 5th or 10th or 20th frame for flythrough animation....not every single frame

cheers
stefan

[wizman]

May be I'm very stupid but i don't understand why flythrough not render animation in 1 file for all frames (like in 3dsmax) - it's the most faster way to render animation and i have more than 2 years working technology.
Why it not now in cinema4d?
Brute Force - very long time and (very impotant!) - have a different picture from LC.

I'm work in Vray in Max since 2003 year and now my brain is damage...

---------------------------
Sorry for my english.

[DanieleF]

Hi guys,
in Flythrough mode the LC is calculated once for all animation length, so you have to render one frame only. What you must care is to set the animation range in the output panel of cinema's render settings.
After that put the LC in From file and Calculate the Irradiance Map in Multiframe mode.
That's all.

Cheers
Daniele

[stefan]

so we have that already in:-)

wizman;
bruteforce: not long time,
this is a common mistake, brute force as secondary gi is very fast, often faster than LC, also the result is more correct.

many pro-users use DMC/brute force, some even as primary engine in combination with lc as secondary.

i am a bit fan of DMC (old QMC) and can recommend it,
any ways you have many choice in vray:-)

cheers
stefan

[wizman]

Thanks.
Ok. I need time to test.