you can fly!? Grid Patterns
  start with a few parallel lines, create fancy repetitive patterns

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Here's a preview of some of the patterns created:

Using the Wireframe Designer filter:

Here's a filter that can be (ab)used for many different things:

Wireframe Designer

While it is often used with Perspective enabled, it doesn't have to be. If you use it as is, you'll get a nice set of horizontal lines. Use the second slider (Sample step) to change the distance between the lines:

Note that the default color of the lines is green, and the background is black. You can change these too, either in the Wireframe designer tool panel or later on.

For example, if you just needed black lines on white background, you can use the threshold filter to correct this.

With the Threshold filter you can find the white lines on black background, or if we want it black lines on white we can simply check the 'Invert' box:

Adding Vertical Lines

The Wireframe Designer didn't draw the 'other' set of lines, i.e. those running vertically, perpendicularly to the horizontal lines it drew. But we can easily add those by taking a sample of the horizontal ones, rotating it 90 degrees and merging it with the original. There are several ways possible to go about this. The most natural way is by using the custom brush system. After all, Project Dogwaffle is all about custom brushes.

Let's pick up the whole current image as a custom brush. The fastest way to do this may be from the Brush menu:

Brush >
   Use selected as brush.

By default, and unless you painted something in the alpha channel, everything is already selected, so it picks up the whole image as a custom brush. You could of course have used some tools like the rectangle Alpha selection tool to define a selection of only a portion, perhaps a square shaped area. But in this example the whole image will do just fine

Now you have the image in the brush and we can easily turn it. Rotating it by 90 degrees is a snap from the Brush menu and even faster with the keyboard shortcut: 'z'

Brush > Rotate > 90 degrees clockwise

We're going to stomp the new brush image (with vertical lines now) into the alternate buffer. Remember that Dogwaffle has the Main image buffer you see and paint into by default, but also an alternate buffer, called the Swap buffer.

Use keyboard shortcut 'j' (for 'jump') to jump (switch) to the swap buffer. Or use the menu:

Image >
    Swap buffers

or on older versions:

Buffer >
    Swap buffers

Note that the window title in the title bar will change from (Main) to (Swap)

You can now stomp down the custom brush image with a single click into the empty swap buffer and see its vertical lines. Make sure you have full opacity.

click to enlarge

At this point, the Main buffer holds horizontal lines, while the Swap buffer holds vertical lines. We're ready to merge them together into a single grid image.

Before we merge the two buffers (Main buffer with horizontal lines, Swap buffer wih vertical lines), let's take a peek and visually mix the two (in multiplicative blend mode by default). This doesn't actually permanently merge the too - it just shows what it would look like if we did.
Just click the large icon in the upper-right corner on the Tools panel.

There will be a small orange marker in its corner indicating when mixing is on.

Now you can permanently merge the Main and Swap buffers together into one image.

Right-click the same Swap buffer preview icon in the upper-right of the Tools panel, and select "Merge with swap'

The Main and Swap buffers are merged. The result is placed in the current buffer (we're still looking at the Swap buffer at this point)

We may want to discard some of the white 'borders' to the left and right of the new image, where it only shows horizontal lines because the image buffers were wide rectangular, not square.

Use the Rectangular Alpha selection tool to select an area closer to a square shape:

Use the rubberband selection box to select the desired portion. Here below it's just showing a small selection. You may want to select more.

Once you have made your selection, crop the image buffer to your selection's size.


 Image > Crop to selection

Finally, here it is: a near-perfect little grid pattern, ready to be used and abused for more artistic explorations with more filters:

Now it's time to play with filters.

Apply the Color Sobel edge detect filters, one, twice,  again and again...

And don't forget to also try other filters, especially from the Transform group of filters, such as Spherize, Sinoid or Wave Displacement, and of course the general purpose and oh-so powerful Displace by Swap.

Here are just a few more resulting grids, using Color Sobel Edge Detect several times and then additional filters like Spherize, Sinoid, and others...


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