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TOPIC: How to make use of Carbon Stress Export - Advanced Topic

How to make use of Carbon Stress Export - Advanced Topic 1 year 1 month ago #195

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The Carbon Stress data that can be exported is the strength being applied in order to preserve the metrics of a primitive.
That sounds a bit abstract, but a primitive can have a number of parameters driving it, so its not just about length or angle , its also about stiffness and viscosity etc. So in a way its how hard that primitive is having to work to preserve it metrics. A primitive that is having to work hard is clearly stressing more than one that doesn't.

For example in fashion they use this data to show issues with fit. Too much stress, size too small, too little stress - size too big.....

To use Carbon Cloth Stress as an example.
To export stress attributes onto the Cloth output mesh, tick the corresponding tickbox on the Carbon Cloth node.
For example Bend Stress as seen below:


Maya visualization
To visualize this, go to the Maya menu bar and select "Modify->Paint Attributes Tool".
Select the output mesh in the viewport or Outliner and pick the corresponding attribute (e.g. bendStress) in the Paint Attributes section.
Attributes can only be visualized this way, if they are paintable.
More for information: knowledge.autodesk.com/support/maya/lear...C1023452012-htm.html



Next, tick "Color feedback" in the Tool Settings and set "Min color" and "Max color".
Keep in mind: Stress is signed, i.e. there are also negative values
There is not default range for stress, so you have to test a few values before you end up with a good visualization. The example above uses 0.0 for Min color and 0.00001 for Max color.

Houdini visualization
Assuming you are in dop go to a sop geometry, create carbon dop import to bring simulated cloth geometry inside sop.
Stress will be point attributes on the geometry.
You can use paint node to visualize.
Use range on paint node to get a good visualization.
Keep in mind: Stress is signed, i.e. there are also negative values
There is not default range for stress, so you have to test a few values before you end up with a good visualization.

Stress can be used for a variety of advanced applications.
Here is a small list of the most common ones:
Unlike other cloth sims, Carbon has stretch limits and so stress allows you to check if a garment fits nicely, for example, if there is a lot of stretch stress, the garment might be too small.
You might also use stress data to drive rendering details such as;
wrinkling, or making a dress more translucent where there is a high stretch stress.
If you were using Carbon Tetras for facial sim you might use it to input into skin blood flow (colour) for rendering.
There are so many advanced possibilities
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How to make use of Carbon Stress Export - Advanced Topic 8 months 4 days ago #301

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Updated to include information on visualization in Houdini

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