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JFraser

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Reply with quote  #1 
I am trying to render a simple interior scene with maybe a dozen lights in it and a few reflective materials @ 2048 x 1536, using the .46 very fast interior preset. I have previously rendered a larger scene using this setting, which took 10 hours (i think, as i left it over the weekend and the timing bar said 10 days!). this scene however is taking much longer than I would expect for such a simple scene. It has been 20 minutes on 0% prerednering for instance!

Can i email someone this model to see if something is making it run so slow? (its 20mb file) Or is there anything that could be slowing it up? (I have a lot of hidden components etc, but didnt expect these to afect the render.

JFraser

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Reply with quote  #2 
Sorry!!!

Im using V2 beta .46 on Windows XP

JFraser

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Reply with quote  #3 
having investigated myself to what the problem can be, I have included a model of one components from the main model (which is at the centre of the view. see jpeg). This itself is very slow at pre-rendering, giving an estimated time of 3 - 10 hours! This jumps up and down...i have left it rendering up to 4%, then lost patience.

Can anyone give any advice? Surely it must be quicker? Many larger, more complicated models of mine (which include this component) have been a lot quicker, and have skipped through prerendering quicker than this..isnt this 'very fast interior' preset?

Attached Images
jpeg temp.jpg (543.14 KB, 61 views)

 
Attached Files
skp temp.skp (673.14 KB, 13 views)

sepo

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Reply with quote  #4 

why do you need double skin glass?

JFraser

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Reply with quote  #5 
Double glazing and the thickness was specified in the design.

Are you saying this affects prerendering and could be the problem?

sepo

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Reply with quote  #6 
I am not sure 100% but you will find reflections multiplying and those are  the ones which take  time.
Maybe Jure will chime in to comment.
JFraser

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Reply with quote  #7 
ok.....Jure...Chime away!

also im finding interior high quality and interior default presets much quicker than interior very fast.... is this explainable?

Jure

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Reply with quote  #8 
It looks like there's a bug in the engine there that makes it render really slow. We'll fix it.
JFraser

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Reply with quote  #9 
o really. cheers Chime.....will that mean i have to re-install or re install the preset?

Just this is for a deadline.

JFraser

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Reply with quote  #10 
I mean cheers Jure...sorry mate.
JFraser

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Reply with quote  #11 
Jure - any progress on fixing the bug?

Im not sure if this is a problem with the preset or with V2.48 in general? either way, could you let me know as i have another deadline and if it cant be resolved, i will try something else.

bigstick

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Reply with quote  #12 
When is your deadline? I'm absolutely certain we won't get a fix in time.

If the component in your post is the problem. I'll look at it and see if I can find a solution.

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bigstick

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Reply with quote  #13 
There are a number of things causing slow render time here.

I have made some small changes to this component and reduced the render time from 23 minutes to 53 seconds, even having added blurred reflection to the metal frame.

1. Circular LEMs - just don't do it! Use a square LEM, they render much faster
2. Double thickness glass with reflectivity both sides. You really need to think about what effects you want your materials to have. If you want a sandblasted diffused translucent glass box, it has no reflection. Perhaps a touch of blurred reflection, but just on one side. Why on earth would you want to calculate reflections inside this structure? I have duplicated the material, set it to zero reflectivity and applied it to the back/interior faces. I have also used this material for the shelves inside the box.

Modified component attached.

Attached Images
png temp_2010-08-10_19114500000.png (81.83 KB, 49 views)
png temp_2010-08-10_18420500000.png (76.70 KB, 55 views)

 
Attached Files
skp temp.skp (676.82 KB, 2 views)


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JFraser

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Reply with quote  #14 
Thanks for tips Bigstick. I will amend the model myself as you have suggested. I never knew about the folly of round LEMS (an explaination why maybe?)

Please excuse my nievety on wanting to calculate reflections on the inside of my glass casingy. I am a newbie to Podium V2 and, like your Podium V2 itself, I am still going through teething problems and trying to learn along the way, we are not all pro's like you!
I had just modelled the component as set out by the designer specified and this is why it had double thickness glass. I wll go back and simplify the glass, model and reflectiveness and hope this will shorten the render time.

I will post my results for any other advice.
p.s...i couldnt see anything attached?

michaliszissiou

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Reply with quote  #15 
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Why on earth would you want to calculate reflections inside this structure?
I asked for fake spec, every renderer has this and the answer was something to do with my personal needs. Fake spec is a really fast effect. 
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