Grease pencil edit extrude : odd behavior

[Paul Caggegi]

You can further tweak your brush settings – Advanced, Stroke options – and in your brush tool window (N-Key, Tool Tabe) you can adjust the curve that will dictate how the pressure sensitivity should act. You also have post-processing and randomize settings to play with as well.

[Kevin Mather]

Hi @pcaggegi , in 3.4.0 it is set to round with the button. (I think that was also the default in 2.81a although the control is in a different place.)

I’m using strength 1.0, fixed radius, with tablet controls all disabled. (I have a tablet but often use the mouse.)

The line ends appear as round while extrusion is being done.

If I then scrub/step back and forth in the timeline, (while the duplicated stroke points exist), the ends appear square/angled for all keyframes except the last.

When each hidden duplicate stroke point is dissolved, the affected end then correctly appears as round.

After all the duplicated stroke points have been dissolved, scrubbing back and forth displays the ends properly as round at every keyframe.

Hopefully this clarifies things. It’s a little hard to explain without a video.

[Kevin Mather]

Extruding on a straight line minimizes the artifacts. I should have chosen a better example like a curved path. But invisible duplicate points occur in either case.

 I imagine that real artists rarely use edit mode. Since I sketch/paint poorly, I use it a lot 😉. And it is extremely handy for “geometric”/“SVG-like” animations.

[Paul Caggegi]

Hi @techworker1 – yes this problem persists even in the latest version of Blender. I don’t know why it happens, I’m sorry, but I do offer an alternative. Instead of extruding one point at each keyframe, do this: draw the entire stroke/image. Then apply the build modifier. This will allow you to animate the stroke drawing on AND have control on how fast or slow it happens. Check this video out

[Kevin Mather]

Thanks to all.

For stroke zero-to-full-length, Build modifier is clearly the simplest.

For sliding a stroke along a curved path (similar to 3D Curve modifier), there are several ways to redraw or edit the stroke. I was using extrude-head + delete-tail (with cleanups) since this seems easiest and most accurate. Of course a full draw at a new position (classic method) or other edit operations are also possible.

Putting this one to bed for now.

[Paul Caggegi]

To put on a bow on – you can always add a second build modifier and set it to erase the line as well. 🙂

[Kevin Mather]

Yeah, I thought of that too. As they say in Perl, TMTOWTDI – there’s more than one way to do it. 

[Martin Bergwerf]

I’ll have to remember that acronym 👍🏻

[Kevin Mather]

AKA the “Tim-toady” principle.

[Kevin Mather]

It seems that the Length modifier (3.x only) is the one I really want for what I was trying to do.

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