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      Effect:XY Rotate
      Category:Spatial Filters
      Speed:Fast

      Description: The XY Rotate Effect is a Spatial Effect that only modifies the drawing coordinates to impart a rotate.

      Most Effects in Pena use one of four coordinate systems:

      • Texture, Fit To Screen - This is used if you are using Effects that reference Textures, and you are not using the Fit To Brush option.
      • Texture, Fit To Brush - This is used if you are using Effects that reference Textures, and you are using the Fit To Brush option.
      • Drawing, Fit To Screen - This is used if you are not using an Effect that reference Textures, and you are not using the Fit To Brush option.
      • Drawing, Fit To Brush - This is used if you are are not using Effects that reference Textures, and you are using the Fit To Brush option.
      Basically, it comes down to whether an Effect uses a Texture or not, and whether or not you are using the Fit To Brush option.

      XY Rotate can impart a rotation to any of the above coordinate systems. It just depends on which one you are using for a particular Effect.

      XY Rotate affects everything below it that corresponds to the coordinate system you select in the XY Rotate Options. You place XY Rotate first, then any Effects you want to modify.

      For example, if you have Slots in the following order:

      1. 2-Color Gradient
      2. XY Rotate
      3. 4-Color Gradient
      4. Brick Wall

      Then 2-Color Gradient is not rotated, but 4-Color Gradient and Brick Wall are rotated.

      Note that since XY Rotate affects the XY Coordinates, not the Color, it affects any Effects for both Color 1 and Color 2.

       
      Options: The XY Rotate Effect has the following Options Pane:

      X Rotation:This is the number of degrees to rotate the X axis (-360 to 360). If this matches the Y Rotation, it is a normal rotate, otherwise it is a sheer.
      Y Rotation:This is the number of degrees to rotate the Y axis (-360 to 360). If this matches the X Rotation, it is a normal rotate, otherwise it is a sheer.
      Texture Screen-Fit:If set to a Red X the regular Texture coordinates (non-Fit-To-Brush) are not rotated. When set to a Green Check Mark the regular Texture coordinates (non-Fit-To-Brush) are rotated. Use this for any Effect you want rotated that use Textures.
      Drawing Screen-Fit:If set to a Red X the regular Non-Texture coordinates (non-Fit-To-Brush) are not rotated. When set to a Green Check Mark the regular Non-Texture coordinates (non-Fit-To-Brush) are rotated. Use this for any Effect you want rotated that does not use Textures.
      Texture Brush-Fit:If set to a Red X the Fit-To-Brush Texture coordinates are not rotated. When set to a Green Check Mark the Fit-To-Brush Texture coordinates are rotated. Use this for any Effect you want rotated that use Textures and also Fit-To-Brush.
      Drawing Brush-Fit:If set to a Red X the Fit-To-Brush Non-Texture coordinates are not rotated. When set to a Green Check Mark the Fit-To-Brush Non-Texture coordinates are rotated. Use this for any Effect you want rotated that does not use Textures but does use Fit-To-Brush.

      Example: In our first example we have XY Rotate in Slot 1 and a Texture Effect in Slot 2 with a photo loaded. A 45 degree rotate generates the following image. Note that the edges of the photo are clipped by the edge of the screen:

      Here is the same thing using a 4-Color Gradient in Slot 2:

      In this image we have set the Fit To Brush option for the Texture, and painted with a large brush. Notice two things... first, the brush (a large square brush) itself clips the Texture... more interesting, we seem to still clip as if the original Texture is rotated and not Fit-To-Brush. Why?

      The answer is that by default XY Rotate has all four Coordinate transforms set to a Green Check Mark. We are only interested in Texture Brush Fit right now, so turning off Texture Screen Fit will stop that extra clipping, as seen below:

       

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