Hi, I’m just starting to learn Zbrush and I have run into a problem with zsketch. Hopefully someone can help me.
When I draw with zsketch on a zsphere frame, the draw size is controlled by how zoomed in I am, rather than the draw size I have set. I have tried toggling ‘dynamic’ but it hasn’t made any difference. I have also tried using different zsketch brushes. What am I doing wrong?
Hi @TohGrimm ,
I’m not sure I see anything unexpected in your images.
Dynamic mode is the recommend setting, the default, and is required for the use of some brushes. When this mode is enabled the brush size will be relative to the mesh size in the viewport.
In other words, if Dynamic mode is enabled and you size the brush so that it just fits the head of a character inside of its radius, the brush radius will resize itself so it just fits the character’s head in its radius no matter what size the character mesh is on the canvas. The reason your brush size is different when you have Dynamic mode enabled, is because your mesh is at a different level of zoom on the screen.
When Dynamic mode is disabled the brush retains its absolute size no matter what size the mesh is in the viewport. So if you size a brush to just fit the the character’s head inside its radius and then zoom in on the mesh, the brush will then be much smaller in relation to the head.
Hi @Spyndel
Thank you for your reply.
I realise that I have not explained the problem fully. All the zsketch marks in the screenshots were made without changing the draw size. In the first two screenshots, I had dynamic enabled but the zsketches produced are different sizes. In the second two screenshots, I have disabled dynamic and drawn new zsketch marks onto the zsphere armature. In both cases I drew the smaller zsketches and then zoomed out and drew the ones that are appearing larger.
It seems to be that Zbrush is behaving as if dynamic is disabled even when it is enabled. I have restarted Zbrush and the computer but the issue is still occurring. I am wondering if there is another setting or control that could be causing this or if it is a bug of some kind?
Hi @TohGrimm ,
Sorry for any misunderstanding, but my original answer remains the same. I only see expected behavior in your screenshots. Please only evaluate the behavior based on the apparent size of the cursor relative to the mesh. There are many variables like pressure sensitivity that account for how large an actual stroke ends up being. The brush radius does not tell the whole story in terms of how large of a mark a brush ends up making on a mesh.
Please see the following image.
Top Image: Dynamic Mode enabled. The cursor resizes itself as you zoom in and out on the mesh, but keeps its size relative to the features of the mesh. My cursor in the top image just encompasses the radius of that ZSphere and keeps this size relationship no matter how close or far I zoom the mesh.
In the lower image with Dynamic disabled the cursor is an absolute size and when I zoom in on the mesh the target surface area increases but the brush cursor remains the same so it becomes smaller in relation to the features of the mesh.
Any differences in the size of the eventual stroke being made are going to be subject to dozens of brush and stroke variables like pressure, speed, focal shift and other brush settings.
If your experience does not match what I’ve shown here, please contact ZBrush support to troubleshoot your installation.
Thank you!
Hi @Spyndel,
Thank you for your help with this.
These are some more screenshots:
The draw size is set to 64 and Dynamic is enabled. The zsketch on the right was drawn and then I zoomed in and drew the zsketch on the left. I did not adjust draw size, intensity or focal shift. I did not vary the pressure, either. In fact, the zsketch brushes do not seem to be responding to pressure at all. The two zsketch strokes are different sizes. Based on the Classroom tutorial and your screenshots and descriptions, this does not seem to be the intended functionality.
Also, unlike in your screenshots, my cursor does not reflect the size of the zsketches and is much smaller.
There is something else that I have noticed which may be related:
When I zoom out, the smaller zsketch disappears inside of the larger ones. This did not happen in the Classroom tutorial.
The issue could be with my Wacom. However, all other draw functions work and the drivers are updated, so this seems unlikely. I have also tested by restarting the computer with the Wacom unplugged and using the mouse to draw zsketches. The issue is still present.
I have seen a similar problem discussed before but the solution was always to enable Dynamic. Of course, in my case, Dynamic is already enabled.
I contacted ZBrush support prior to joining the forum, and they told me that they could not help with this issue and that my only option was to ask here.
Thank you again.
