44 votes

What does the simplify AO bounces value do?

TL;DR: To put it simply, after n light bounces, Cycles switches the material shader to a simplified diffuse material (i.e. AO), instead of evaluating the full material node tree. This Simplify to AO ...
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  • 11.8k
26 votes
Accepted

File optimization: Duplicate or linked duplicate?

Especially in the case of things like trees you could use linked duplicates. You can create those with Alt+D. But if you have already created the normal duplicates in your scene you can still link ...
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13 votes
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How to render a scene faster in Cycles?

You can't just "render faster" for the most part, there are really no shortcuts or magical tricks. You can optimize your scene, tweak settings, and adjust parameters. While these can under ...
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12 votes
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Is it possible to dynamically reduce the number particles based on distance from camera?

You can use a script that calculates the distance of each vertex in your grass field from the camera at each frame, and updates a vertex group controlling your particle system's density accordingly. ...
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  • 15.2k
11 votes
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Managing/Reducing noise in a night scene

Scenes with many light sources (like this one) tend to be noisy because by default cycles randomly picks one light source to sample for every ray. In such scenes a decent improvement can be gained by ...
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  • 152k
9 votes
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Use all Ram on Blender when rendering? (Cycles and Blender Render)

No. Memory is for storing information. If blender doesn't have 32GB of information to store, then it won't use up 32GB of memory. To force blender to use more ram than it needs would mean reserving ...
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  • 152k
9 votes
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Blender 2.78 file size grows and does never shrink

If your file has a large size and your scenes are apparently empty it means there are other datablocks saved in your file but not in current use in your scenes, or at least your current scene. Try ...
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8 votes

Is there a way to tell Blender NOT to load certain images during render?

This can be achieved by enabling "Use Camera Cull" in the Simplify settings in the scene tab, though it will remove entire objects that are not in the camera's view instead of just textures and will ...
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  • 1,151
7 votes

What does the simplify AO bounces value do?

You scene shouldn't get darker if the world value is turned to the proper values you can usually replicate the look you had before. Also the AO falloff size has a huge affect on how it looks.. Usually ...
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  • 191
6 votes
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Reducing internal faces generated by extensive curve extrusion?

There are a few things you can do: 1 Reduce curve resolution - Both in your curves and in your section defining objects 2 Eliminate unnecessary vertex - In straight line segments you don't need all ...
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6 votes
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How to not render unnecessary tiles?

There is no automatic way. Cycles render engine uses path tracing to render a scene. In order to calculate whether there are additional objects that might cast light/shadow in a scene, it has to ...
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  • 6,525
5 votes
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How to find unneeded/useless vertices

Enter edit mode select one such vertex like you did in your screenshot and press Shift + G > Select Similar > Amount of connecting Edges Exercise some caution as this will automatically select all ...
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5 votes

What does the simplify AO bounces value do?

The only documentation of this feature at the moment appears to be the tooltip: Approximate indirect light with background tinted ambient occlusion at the specified bounce, 0 disables this feature. ...
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5 votes

How to avoid white lines in texture while resizing

Pixel snapping, or in more general, being exact is kind of your enemy here. Being exact makes you vulnerable to an off-by-one error. A safety margin is what protects you from such errors, hence my ...
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4 votes
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Is there a timeout/max capacity in blender's phyton scripts?

Your srcipt is fine, and blender is not timing out, but rather you have found a limitation of blender. Blender is not good at displaying many objects, 250,000 different cubes will crash blender. Try ...
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  • 47.7k
4 votes

Blender doesn't use system resources optimally

Blender most likely is fully using your system resources. In the task manager, change one of the charts to display CUDA and you'll see that its being fully utilized. I just started a render on my ...
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  • 4,637
3 votes
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Does Blender create large cached files on Mac computers?

The cache files that you are probably referring to are BVH cache files created during rendering with Cycles render engine, if the Cache BVH option as been activated for the current file. Unless you ...
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3 votes
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I cannot get a scene to render in blender

Your ParticleSystem2 setup for your pebbles is what is bogging down the render. It's currently set for 30k particles with 100x children to render which I think is the source of your infinite render ...
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3 votes

Blender game runs very slow

You can always tell what it jacking up a game by turning on FrameRate/Profile, an option under the "Game" tab. In realtime, it will dynamically calculate how much time blender is spending on each ...
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  • 7,459
3 votes

Managing/Reducing noise in a night scene

I have fireflies on a glossy surface - caused by particle emitters. I'm addressing this by rendering the particles as a separate pass, along with a non-glossy parent object (parent of the particle ...
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3 votes

Speedup Cycles for material-only renders

To speed up Cycles, you are going to have to sacrifice realism. If that is okay for your projects, you might try adjusting the filter glossy field, disabling Shadows, Caustics, and Bounce light, , ...
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3 votes

Object displacement over LOD

The simple answer is that modifiers aren't fully supported by the Game Engine. While modifiers will typically be rendered by the Game Engine, they won't be updated by the engine. So what's happening ...
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  • 10.9k
3 votes
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Profile a blender file to optimize render speed and quality

The Cycles Roadmap mentions the following goal: Statistics: for power users to investigate why rendering performance is slow, why memory usage is high, which objects or materials to optimize, etc. ...
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  • 3,479
3 votes

Blender for Game Development - Unity3D

I'm not an expert and have never used Unity but from my experience the golden rule of optimization is to reduce the amount of draw calls in the CPU. Each mesh in the scene induces a draw call. You ...
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3 votes

AMD RYZEN Particles and Physics Simulations optimization needed

Physics calculations are extremely hard to thread and there is, as far as I know, no magic setting to change this. Think of it this way. Rendering you can do frame one and frame ten at the same time. ...
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  • 1,530
3 votes
Accepted

MakerBot won't slice my model

You have (what looks to be) several orphaned edges in the model that I found by selecting all vertices in Vertex select mode, then switching to Face selection. I can't say if this is what's causing ...
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  • 6,006
3 votes
Accepted

Is there a way to allocate more memory to GPU for the GPU Compute

Your computer already do this automatically. VRAM is only storing very frequently-used resources that need to be accessed in a very short amount of time. If/when the VRAM is used up, most computers ...
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  • 867
3 votes
Accepted

Does Blender bloat unnecessarily the Windows Registry?

If you are unsure about entrys in the registry and want to keep your system clean, you can take the portable version. Extract to a folder of your choice and pin to startmenu or what ever. I ...
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3 votes

Why does memory and file size increase when objects are joined?

The way I see it the issue is twofold. Instancing Separate objects benefit from instancing optimizations. If objects share the same object data (geometry) Blender only stores such geometry once, and ...
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3 votes
Accepted

Reduce subdivision quality in viewport on multiple objects at once

One way is to use the Simplify function. You can set Max Subdivision for Viewport or Render in your whole scene. Render Tab > Simplify > Viewport
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