Learn about applying friction and drag with a mesh.
- [Instructor] Friction and air resistance…are handled by the Bifrost motion field container.…The motion field is very versatile…and can generate multiple different properties…simultaneously.…We've only seen one property so far, which is direction.…Now we'll use the geometry property to simulate friction…and the drag property for air resistance.…We have one motion field in this scene,…and it's creating initial velocity for the fluid.…
If we go to its field direction section…in the attribute editor, we're applying…an initial velocity in positive Z.…We could do everything in this demo…with just this one motion field,…but to keep our sanity, let's use two different fields.…One for the initial velocity,…and one for friction and air resistance.…Rename the existing field before creating another one.…In the outliner, double-click bifrostMotionField1,…and let's rename it.…
We'll called it bifrostMotionFieldVelocity.…Just to ensure that your results are similar to mine,…let's set the motion field transforms precisely.…We can go to our four viewport layout,…
Author
Aaron F. Ross
Released
11/8/2017- Bifröst basics
- Analyzing the node structure
- Emitting from a polygon mesh
- Colliding with a polygon mesh
- Adding velocity, friction, and drag with motion fields
- Optimizing space and time accuracy
- Caching simulations
- Meshing and exporting liquids
- Render-time meshing in Arnold
- Applying channel data to Arnold shaders
- Generating foam from a liquid
- Rendering and shading foam in Arnold
Skill Level Advanced
Duration
Views
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Introduction
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Welcome51s
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Using the exercise files3m 3s
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1. Simulating a Liquid
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Meeting prerequisites2m 57s
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Understanding Bifrost3m 46s
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Choosing Bifrost options7m 20s
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Setting scene preferences3m 34s
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Laying out the scene3m 34s
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Emitting liquid from a mesh7m 39s
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Colliding with objects9m 25s
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2. Fine-Tuning a Liquid Simulation
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Tuning time steps6m 8s
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Tuning transport steps3m 39s
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3. Caching and Meshing
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Writing a user cache7m 38s
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Meshing the particles10m 28s
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Caching a mesh to BIF files5m 43s
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Exporting to Alembic5m 36s
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Setting an initial state3m 58s
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4. Shading a Liquid
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Rendering meshed voxels4m 52s
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Building a layered shader6m 44s
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Mapping specular roughness7m 59s
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5. Simulating Foam
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Adjusting foam attributes5m 12s
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Caching foam4m 4s
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Rendering foam in Arnold4m 7s
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Conclusion
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Next steps1m
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Video: Adding friction and drag with a motion field