Tips and Tricks on how to speed up rendering

[heartscool]

Tips and Tricks on how to speed up rendering for 3d models
1.) as much as possible limit ur polycount to minimum.
the more poly the slower the rendering.

2.) if ur using vray, always proxy the ones with high polycount.

3.) don't put too much subdivisions on your shadows (as much as possible).

4.) remove unwanted object on your scene

5.) dont use so giant/ultra/high texture if your rendering small output
try to proportion both.

6.) material wise: avoid using too much glossiness and highlights, a simple diffuse, bump and reflection(with .95 - .75) will do.. try not to use archshaders..

7.) use high polys object only when the object is very near to the view or camera

8.) for exterior: standard directlight(as ur sun) and vray environment light is much more faster to render compared to vraysun and sky.. u just need to tweak the colors to achieved the sun&sky effect..

9.) know the difference between copy and instance.. simple but effective

10.) purge undo window, specially commands on the list that eat up memory..

11.) this i part of my resource management, i always shutoff my antivirus while rendering (or dont install at all), specially anti-virus like norton and mcafee (which sucks bigtime) this are memory hog application, same as old Nero updates, always check taskbar once a while, even screensaver and windows eyecandy specially in vista, i turn them off back to basic.

12.) use map efficiently, instead of modelling small details, in par with [#7.]

13.) use xref scene (but not sure duh, havent tried it yet)

14.) use polygon friendly 3dsmax plugins such as mootools' polycruncher, best of all its free tongue

15.) be wary of iteration levels when making curves/meshsmoothing

16.) when using irradiance map, check interpolation, par it with reflection and refraction interpolation on the submenu.. (match it with IR min/max rate with interpolation min/max rate)

17.) caustics are time killer

18.) first pass, brute force vs. irradiance map, (case to case basis)

19.) hardcore noisethreshold and AA subdivision rate, (case to case basis)

20.) be wary of glossy reflection and frosted materials..(case to case basis)

21.) instead of using dof in physical cam, Photoshop can do the trick with an ease with zbuffer channel or plugins like Alien Skin's DoF and DoF Generator PRO by Richard Rosenman.

22.) post process can short the rendering workflow, proffesional composition programs like Autodesk's Combustion and the likes.. just know variations in renderchannels in vray render elements (F10).

23.) Evermotion Archshaders and Archinterior/Exterior Materials are on overkill settings, dont be lazy to edited it once a while, dont just copy and salvage someone's craft as it is.

24.) Irradiance and Light Cache (save to file), skip the computation when using the same sets and scene over and over again.

25.) balance with the resolution output and irradiance map settings.

26. before u place all the shaders. try to override first the materials in the rendering parameters(global switches.).to make sure all polygons are modelled correctly for test rendering so that you would knw the types of shaders u placed individually and u can trace easily which materials could possibly caused the rendering longer.

27).too many lights can also coz the overkill of the rendering.

28). use alwayz the default parameters for fast test renders..

29).For me i prefer ADAPTIVE QMC rather than Adaptive Subdivision...

30).Check your Raycast Parameters too..Like render region division,region sequence etc..

31)If ure using vray displacement mode,try to limit the area if 2d mapping ang setup for it eats a lot of ram.

32) Use 64bit Max

33) The use of X-refs is invaluable--primarily due to their ability to link large sections of scenery together and provide a means to keep your master scene to ballooning to an unwieldy size.

34) Attach those objects - 3ds Max is much more efficient working with 9000 10k polygon objects than 200,000 1k polygon objects. Attaching all the components that are not being individually animated adds a significant amount of speed and flexibility to the scene you're working on.

35) Geometry Proxies - Ah yes, my new favorite tool! A geometry proxy is an optimized piece of geometry that is designed to load and render much more efficiently in specific render engines such as Mental Ray & Vray.

36) Bitmap Proxies - Bitmap proxies are a great way to minimize the amount of RAM that you are expending on a scene.

37) Centralize your data - Centralizing your data adds a level of organization to any project.

38) Work Locally and Incremental Saves - Why you ask? Well, as you save to the network share, you can run into some traffic issues which can on occasion cause crashing and corrupted documents

39) Layers, Groups and Selection Sets - Any organized 3ds Max user has used these at one time or another, though some more than others.

40) Maxscripting - it can bring repetitive and laborious tasks to heal. This has saved me countless of production hours and has allowed us to tackle projects that would be impossible with the stock tools in 3ds Max.

41) learn Photoshop and other compositing softwares (AE, Combustion). you will save hell a lot of render times.

42) understand photography. train your eyes. its good to have a vision of what you want to achieve before you start with your rendering workflow. for example, you'll know when to cancel a render process (region render) rightaway soon as you spot something wrong on your buffer rather than waiting for the whole scene to finish then realizing something's wrong (so much time wasted already) and you have to re-render again. trained eyes helps to influence clients and manage them to understand your vision.

43. Bitmaps - these tend to take up large amounts of RAM, especially if the maps are large. Since textures are managed by 3dsmax, VRay has no direct control over their memory usage. However, you can use the Bitmap pager settings of 3dsmax to reduce the RAM taken up by bitmaps. Turn on and adjust the bitmap pagers into a higher amount, this will address your computer to process the memory in using bitmaps. This is especially useful in rendering large image.

44. You might want to check the multi-threading option if you are using a dual processor.

45. Use Low resolution for rendering tests.

46. Use Rendering Region: render only what interests you. Time to time check your shaders, verify the little differences.. and quickly find the result you’re looking for.

47. Do not add Glossy effects. Add it just when you think that the scene works fine.

48. Geometry - scenes with lots of objects and/or triangle counts require more memory to render. There are several ways to reduce this amount:
-Adjust the raycaster settings in the System rollout (reduce Max. levels, increase Min. leaf size, increase Face/level coefficient, switch from Static to Dynamic Default Geometry).

49. Displacement mapping - objects displaced with the 2d displacement mapping method may require a lot of RAM to render, especially with large displacement maps. If this is the case, use the 3d displacement mapping method. Also, if you have several distinct displacement modifiers with the same displacement map, it is better to replace them with one modifier, applied to all the necessary objects. This is because each modifier will take RAM for the displacement map, separately from other modifiers, even if they have the same map.

50. Bitmap filtering - Summed area filtering uses much more memory than Pyramidal filtering. Use summed-area filtering only for smaller bitmaps

[milki]

Hi, thnaks for this.
Some were very helpfull for me.
But i have question:
14.) tongue? where to find it? can you post link?
And one tip about DoF 21.):
You have to know where you can use posprocess DoF and where not.
For example... when you have noreflections in scene... no reason slow render using DoF in max
BUT! when you use DoF in scenes with reflections... like water surface you should consider using DoF in max because you cannot get Depth map behind reflections. When you look tak focused water it should have sharp siloutte but it reflects something far away so the surface should be blurred... so this is the reason to use max's DoF

but anyway useful post!

[heartscool]

i have find this tips and trick for rendering and like to sharing everyone. Thanks