Rotating Brush

[Kenan Dogan]

Hello all,

I'm using trial version SA 5.5.

I am attaching a screenshot below.

I'm working on manual photo mosaic art. The brush I use always points in the same direction. I want the brush to constantly form in different directions.

Does anyone know how I can do this? thank you so much in advance.

Screen Shot 2021-11-15 at 12.58.49 PM.png

[Synthetik]

 The normal mechanism for adding orientation modulation to the source brush is to use the controls located at the bottom of the Brush Modulation control panel of the paint synthesizer.

So in the screen shot below i setup the Orientation Modulation to track the Image Orientation.

So i used the paint synthesizer Initialize QuickEdit command, then set the Max Path Length in the Path Shape control panel to 1 (so i get a single paint nib), then loaded a cab image we provide in the Brush folder to be an image brush, and did the Brush Modulation control panel edit i showed above, to get the following.

 So the individual brush nibs now have their orientation modulated by the source orientation.  You could just use a fixed Offset value with no orientation modulation if you just want to set it manually. 

Path Orient will track the orientation of a path if you are drawing one.

One thing to be aware of is that a lot of the factory photo mosaic presets maybe using a process called 'path start regionization' as opposed to painting single brush nibs to build the mosaic.  Depending on how the paint synthesizer is programmed for those, it may or may not be possible to rotate the cell contents.

If you have an issue with a specific paint preset, you can point me at it and then i could comment further.

 

[Kenan Dogan]

Many thanks for the quick reply. 

I set the brush modulation according to your setting but I got the same result as below. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I don't want the images in the rectangle to always be in the same orientation.

 For example, the flags below are pointing in different directions.

thank you!

 

[Synthetik]

The image you posted look like 'path start regionization' is being used to generate the individual regions associated with the photo mosaic.

As opposed to working with individual paint nibs directly based off of the source brush that are laid down on a grid.

 

So the Brush Modulation control panel thing i described is either not going to work, or may require a different parameter associated with the Region Fill as Brush control panel to be adjusted before the orientation modulation becomes active.  It all depends on how the paint synthesizer was configured for the preset. 

This is because the path start regionization process in the paint synthesizer first analyzes the source image, then derives a complete set of regions off of it, then individually paints each of those intelligently derived regions using unique region paint nibs that are generated on the fly. It is using the Region Fill as Brush pen mode,  so the source brush is not being used directly as the paint nib, the artificially generated region is.  There are variosu ways the RGB content of the current source brush (or background texture) can be composited into the artificially generated region nib being painted. 

The Brush Modulation control panel does not directly effect the artificial nib being generated in Region Fill as Brush pen mode.  It is specifically associated with the source brush nib, and how it is oriented and sized before being blitted onto the canvas in normal source brush nib painting.

Here's a tip on what i mean by path start regionization.  There are a lot of other mosaic tips available there.

If you tell me the preset name, i can look at it's associated paint synthesizer settings, and comment further.