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# Subdivision and Anti-Aliasing in the Hydra Viewer

# Subdivision

The Hydra Viewer provides three levels of subdivision (0, 1, 2) for the geometry on display.

## Using Subdivision in the Hydra Viewer

| 1. | Select the geometry using the scene graph or viewer.

| 2. | In the Viewer tab, Open Edit > Set Subdivision Level

| 3. | Select the subdivision level.

| 4. | Alternatively use the shortcut keys 0, 1, and 2 to set the subdivision level.

| 5. | You can also check the active subdivision level by selecting an object and opening the menu.

Cubes at various levels of subdivision.

Note: This is only applicable to subdmesh types, so polymesh types will need to be converted first.

# Anti-Aliasing in the Hydra Viewer

The Hydra Viewer offers four levels of Multi-Sample Antialsing. For more information see Specific Viewer Behavior.

The OpenGL driver for the graphics card returns a value for GL_MAX_SAMPLES. This value indicates the maximum supported number of samples for multi-sampling you can have.

To adjust the MSAA, select Edit > Preferences and click hydraViewer, adjust the antiAliasing setting:

• Full - the full value of the maximum number of supported samples.

• Medium - half the value of the maximum number of supported number of samples.

• Low - quarter of the value of maximum number of samples

• Off - MSAA is disabled.

Note: When you open a new Viewer tab, the number of samples in use for MSAA is reported on the Katana console.