The Fill Exposure Using Render Changes dialog box lets you detect if a threshold of changes has occurred between two consecutive images and then expose the affected textures for further processing. It can be used for example to change the texture on a characters shirt only when the shape of the shirt is changed significantly from the previous frame. This avoids unnecessary repetitive texture changes on every frame.
For tasks related to this dialog box, see Animating Textures Based on Action .
- In the Timeline view, select the textures or live-action sequence.
- From the top menu, select Scene > Default Display > desired Display node.
- From the top menu, select Animation > Exposure Fill > Using Render Change.
Wait while Harmony creates a low resolution render of the images to preview.
- In the Fill Exposure Using Render Changes window, use the Frame slider to view the motion change analysis.
- Based on your style preference, adjust the parameters to assign when the texture exposure changes will occur. You can adjust the type of filter to use for the motion detection, as well as threshold values to indicate what will be considered a big enough motion variation for an exposure change.
|Changes Detection Settings||Frame: Use the slider to see when a change is necessary. A red edge indicates there is a large enough motion for the texture to change.|
|Use: Lets you use either the Red, Green, Blue, or Alpha channel, or Luminance difference between frames to analyze the motion changes. The Alpha channel is selected by default as it is the most commonly used parameter.|
|Pixel Value Change Threshold: The percentage of change in a pixel to be considered different from one frame to another. The higher the value, the more change is required when comparing two images in order for a new texture to be used.|
|Area Change Threshold: The percentage of non-empty pixels that must change from one frame to another to be considered different.|
|Fill Settings||These settings let you change the exposure. You can also decide on how many images you want to cycle.|
|First/Last Frame: Lets you set the first and last frame for the exposure change. You can set this for the entire scene or for part of the scene (frames 20 to 32 for example).|
|Number of Drawings in Cycle: Lets you set of the number of drawings to include in the cycle.|
|First Drawing Used in Cycle: Lets you set the first drawing used in the cycle. Your drawings must be named using numeric values only, or number values with a prefix or suffix. It cannot only be letters.|
|Drawing Name Prefix: Adds a prefix before the number. For example, texture_01, texture_02 and so on.|
|Drawing Name Suffix: Adds a suffix after the number. For example, 01_texture, 02_texture and so on.|