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Using the paintbrush
While you're painting, you may want to re-create a specific altitude in different parts of the terrain. If you've changed the brush settings, re-creating a specific altitude can be quite difficult. However, using the Height Picker tool, you can quite easily re-create altitudes by picking up gray levels from different parts of your image and applying them to the brush.
To pick up gray levels from the terrain image:
1 While holding down the spacebar, move the cursor over the Terrain Canvas and click the desired altitude color. The color is applied to the brush.
2 Drag the brush over a different area of the canvas. The altitude color you picked up is applied to the new area.
Brush Behaviors
The Paintbrush in the Terrain Editor paints elevations by default, but this is not the only way of painting using the brush. You can also set the brush to paint effects. This lets you apply elevation effects locally, or to increase/decrease existing gray levels in your Terrain Canvas.
To paint elevations:
1 Click the Menu icon on the Terrain Canvas.
2 Click the triangle icon below the Brush Behaviors heading and choose Elevation from the menu.
The brush paints in shades of gray that are then used to generate altitudes. This is the default brush behavior.
To apply an effect locally:
1 Click the Menu icon on the Terrain Canvas.
2 Click the triangle icon below the Brush Behaviors heading and choose Paint Effect from the menu.
3 Click the Elevation tab in the Editing tools palette.
4 Hold down the Spacebar and click the Elevation effect you want to paint.
5 Drag the paintbrush over an area of your canvas.
To remove an effect locally:
1 Click the Menu icon on the Terrain Canvas.
2 Click the triangle icon below the Brush Behavior heading and choose Unpaint Effect from the menu.
3 Drag the paintbrush over an area of your canvas where you applied an effect locally.
The Unpaint Effect brush only affects areas where you applied an effect with the paintbrush.
An effective way of using this brush is to paint an effect in broad, easy strokes, and then selectively unpaint areas of effect.
To erode areas of your terrain:
1 Click the Menu icon on the Terrain Canvas.
2 Click the triangle icon below the Brush Behaviors heading and choose Erode from the menu.
3 Drag the paintbrush over the area you want to erode.
The paintbrush applies the erosion effect to the area painted over.
To lighten gray levels:
1 Click the Menu icon on the Terrain Canvas.
2 Click the triangle icon below the Brush Behavior heading and choose Maximum from the menu.
3 Drag the paintbrush over an area you want to lighten.
In this mode, gray levels in your canvas that are below the current gray level are lightened to match the current level. Values above the current level setting are untouched.
To darken gray levels:
1 Click the Menu icon on the Terrain Canvas.
2 Click the triangle icon below the Brush Behavior heading and choose Minimum from the menu.
3 Drag the paintbrush over an area you want to darken.
Gray levels in your canvas that are above the current gray level are darkened to match the current level. Values below the current level setting are untouched.
Modifying Brush Behavior
The Option/Alt key can modify the behavior of the paintbrush on-the-fly.
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