Viewerhelp:Upload Model - Physics

Help article in progress.

Level of Detail > Physics > Modifiers > Calculate weights & fees > Upload

This tab is the second step in the model upload process.

A model's physics shape defines how it collides with other objects, and is typically simpler than its visual appearance to reduce computational cost. For example, a complex vehicle model might have a square physical box shape. NOTE: Models meant to be used as vehicles must not have a physics cost higher than 32.

Step 1: Analysis and Step 2: Simplification are not mandatory for creating a physics shape for your model, but can significantly decrease your model's physics weight.

After you make selections in this tab, click the Modifiers tab.

Use Level of Detail

Select this option to automatically generate a physics model based on an existing visual level of detail, then select: Lowest Low Medium High Lowest or Low are adequate for most purposes and incur a relatively small physics cost.

File

Select this option to upload your own physical model from a .dae file. This allows you the greatest control over your model's physics shape. Click Browse to select a file.

Step 1: Analysis

Method

Select a decomposition method for the model. Each method is best suited to a particular type of shape, because it will return the most accurate and least costly results for models of that type: Surface - best for curved, organic shapes, such as an animal body. Solid - best for objects with sharp angles and a clear inside and outside, like buildings. Wrap - best for very complex shapes, such as trees and branches.

Quality

These values determine how much combining and overlap reduction is performed on the hulls at the decomposition stage. High returns the best simplification results, but requires the most time to process. If you experience performance problems during this step, try Preview setting first to confirm your smoothing and Close Holes results, then switch to High to get the best simplification results.

Smooth

Sets the tolerance when the utility tries to merge coplanar triangles. The value refers to the angle between adjacent triangles for which merging is permitted. A value of zero allows some angle between triangles, resulting in gently curving surfaces being flattened. A lower Smooth setting results in a lower physics cost for objects with curved surfaces.

Close Holes (slow)

Attempts to fill any holes in the physical representation of the model to fix minor errors in the mesh. However, checking this setting also closes intentional openings in objects: do not use for models that have intentional openings, such as door frames.

Step 2: Simplification

Method

Select a simplification method: Retain %: Select a percentage of the hulls to retain from the original analysis. Detail: Reduces the complexity of the physics model based on the Detail Scale slider. Better Detail: Similar to Detail, but does a better job preserving openings in your model.

Passes

Increasing the number of passes creates results with fewer overlapping hulls and more accurate overall representation of your model's physical shape.

Detail Scale

Reducing this number preserves more fine detail in your model during the simplification process. Larger values result in a decreased physics cost, but lower accuracy in the physics model. For many models, most of the simplification takes place at very low values, between 0.0 and 0.3, after which the physics model is reduced to a single hull.

Preview Spread

Move the Preview Spread slider to explode your view of the hulls that comprise your physical model. On objects with many hulls, this can help you to find and examine hulls that would not otherwise be entirely visible.