Production > Effects > Filter Effects > Exposure Fill Using Render Change

Exposure Fill Using Render Change

A frequent effect applied at the compositing stage is texture overlay. Either a shaky textured line will be applied on an animation or colour fills will be replaced with textures. Most of these effects are created using the Colour Override effect—see Colour-Override .

You can replace a colour fill with a static texture, but you can also replace that same colour fill using an animated texture. For example, a character could have a wool sweater. Four or five variations of a wool texture could be used to fill the sweater zone and looped throughout the animation sequence. This way the final animation can have a bit more of an organic style with moving textures and shaking lines.

You might also want to control when the textures move. When your character is still, you might want the texture to remain still as well. You could also want the texture to remain still if the character only moves slightly. You can control when the texture will move based on the animation motion. You can set the parameters that define what is considered a big enough change for the texture to start moving.

The motion analysis is based on the rendered images sent to a Display node. You could use the main Display node set below your final Composite node or you could add a specific Display node to analyze a specific portion of your node system, such as a character's sweater layers—see Display Concepts.

To help display the scene, use the Advanced Display. In the Preferences dialog box, select the Advanced tab, then select the Advanced Display option. This allows different views to use individual Display nodes.

The Exposure Fill Using Render Change command can be applied on any drawing or bitmap layer, but the most common case where this feature will be used is on a bitmap or drawing layer connected in a Colour-Override's texture port—see Overriding a Colour with a Bitmap Image Sequence. The overridden colours should use the Texture - Use Image Input setting. Note that you might need to parent your character's master peg to the texture layer for the texture animation to follow your character.

NOTE: The Exposure Fill Using Render Change command modifies the timing (exposure) of the selected layer. If you modify the character animation, you may need to reapply the exposure fill as the texture's exposure might no longer give the same final result.