Scene optimizing
Mescalino
Posts: 436
Small question.
I have a scene indside a building, say a restaurant. I zoom in with my camera so overlook only 1 table.This means 90% of the interior is not needed and could potentionaly be removed.
Will this only drop the needed Memory or will it also improve my render time as it doesnt have to calculate the shadows of the unneeded items. Or does DAZ limit the render calculation only to the view/camera screen.
Post edited by Mescalino on
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Comments
It will help with the memory load, and the rendering time. Just be aware that it will also affect the lighting in the scene, as there will be no shadows from anything that is deleted (tables, shelves, walls, ceiling, etc)
Ah right, of course. So if i was to remove stuff, I should do it outside a certain radius of my focal point so to speak.
If you are rendering in Iray the surroundings have much more of an effect. In an enclosed space Iray works out how light is reflected off everything including the walls, floor and ceiling and how this illuminates the rest of the scene. 3Delight doesn't do this, you have to use special ambient lights if you want to fake the effect.
I don't know how much difference you would see from removing the surroundings, I haven't tried it yet although I intend to since my system struggles a bit with complex scenes. I expect it will depend on the lighting and how reflective the surrounding objects are.
Its for a VN and even though i will be usig batch rendering (in Iray) i want to find the right ballance between quality vs render time. So if i can reduce the render time i may be able to amp up the quality a bit.
A render that takes an hour means i can do 16 renders while im asleep and at work over a week thats 96 (sat and sunday only 8) which would be a decent output but if i can double that it would free up more space to optimize certain renders, fix clipping issues. But also to have some extra time available render candle light room (which takes more time) without having to use ghostlighting.
DELETE the furnishings and such, consider leaving the light and the walls/ceiling. Use Scene Optimizer to reduce materials and maps that will NOT be seen. If you are far enough away you can reduce large material maps. Be sure you ahve a lot of light too!
If you need to leave items in just to cast shadows, but they won't be visible on camera, you can remove the textures for those objects. That should free up some RAM.I can't access it from my phone right now, but I think there is an easy way to do this without having to remove them all one by one.
..if there is anything that is reflective in the scene you may need some form of indoor IBL or a an interior photo backdrop behind the camera to provide imagery otherwise it may not look right particularly if you leave out walls as you will have nothing to catch in the reflections.
In my experience, even deleting a wall can have adverse impact in iRay. For example, let's say your Render Settings > Environment has a sky image of some kind in your Environment Map setting. This is good because there is now something to see outside the (hypothetical) window in your scene. You are rendering using a Dome Only or Dome and Scene. I have had cases where the surfaces near the missing wall will have a blue tint because of the lighting from the blue sky in the environment map. Individual milage may vary depending on the specific map and the specific scene.
Ah yes i remember doing a render that was extremely over exposured to light and i could not figure out why all the other renders in the same scene where good.
Then it struck me, i removed the ceiling cause the camera position i wanted ended up inside the ceiling. I then placed the ceiling back and fiddled with the camera to get a good alternative place and the render was fine. So i do not think i will remove any walls, floor or ceiling. But reading all the comments i will do the optimizing as sort of a last resort.