How to avoid these knots

[untalmau]

how to avoid these knots
hi i’m using ZB R6
and when you use the curved d mode, to generate snakes,
when I pass over them, it generates these knots for me.
How can I avoid it?
I leave a video below.
I fully appreciate any help.
Thank you
.

[Spyndel]

As I told you previously, your program version is too badly out of date. The features I would recommend using may not even exist in that program yet, and troubleshooting a program version that is missing years of fixes is just impractical. For these and other reasons, obsolete program versions are not supported.

Upgrading is free for registered users. There is also a time limited demo of the current version of Zbrush. Once you have upgraded, I can be of more help.

[untalmau]

thanks …
i downloaded a temporaly version of
zbrush 2020 v 1.1
mac os version already installed now
thanks
please help … and sorry to bother a lot.

[Spyndel]

I recommend using the curve tube snap brush, rather than the brush you are using.

Once you have committed a tube to the surface of the mesh, it becomes a part of that geometry’s surface as long as it’s part of the same subtool and visible. If you draw another tube over top of an existing tube, your stroke will conform. It will read the existing tube as a bump in the surface and react accordingly–though much less abnormally than the result you were getting previously.

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You can avoid this by:

1. Splitting the previous tubes into a separate subtool via one of the functions in the Tool > Subtool > Split menu, and then either hiding that subtool or activating transparency + ghost mode. You will then see the previous tubes as ghosted images, and they will not affect the surface when you draw through them.

or

2. Hiding the previous tube by Ctrl-Shift clicking it first. You can then draw a tube over the underlying surface without the previous tube getting in the way.

or

3. My preferred method: Switch to the Topology brush and draw out your intended tubes as curves on the surface of the target mesh. With those curves still active, switch to the Curve Multi Tube brush, and click on the active curves with the brush at desired settings. It will draw all of the tubes out along the surface at once, wherever you had curves. Since they are all drawn at once, they do not react to each other at the intersections.

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Also keep in mind, that if your plan is to fuse these tubes to the underlying geometry, you could also simply use the Lazy Mouse 2.0 features to sculpt them directly onto the surface. Lazy Mouse will let you continue a stroke where it was left off, and if you store a morph target first, it will let you use certain brushes at a fixed depth (no bumping up at the intersections).

[untalmau]

@Spyndel

2. Hiding the previous tube by Ctrl-Shift clicking it first. You can then draw a tube over the underlying surface without the previous tube getting in the way.
   or
3. My preferred method: Switch to the Topology brush and draw out your intended tubes as curves on the surface of the target mesh. With those curves still active, switch to the Curve Multi Tube brush, and click on the active curves with the brush at desired settings. It will draw all of the tubes out along the surface at once, wherever you had curves. Since they are all drawn at once, they do not react to each other at the intersections.

thanks i will try to use this number 2 and number 3 … really thanks a lot …
now , i was trying yesterday to use Curve Multi Tube snap brush, and works perfect but the tube go and penetrates the surface … and i need different… and
I need to attach the tube to the contour of the surface …
i mean NOT penetrate the surface.
…
and second using: Curve Multi Tube snap brush
I need the tube to start thick and finish thin.
like a vein or artery, attached to the skin.

i quote and reply to you too…
again thanks a lot… with all heart

[Spyndel]

The Curve Tube Snap brush will snap to the surface of the target mesh. This is fine if you are drawing tube by tube.

The Multi tube brush will not snap to surface–even if you enable snap in the the stroke > curve settings for some reason. I recommend the Multi-tube brush for use with the topology brush. The topology brush curves do snap to surface, and then the multitube brush can draw tubes along all those curves at once.

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@untalmau

I need the tube to start thick and finish thin.
like a vein or artery, attached to the skin.

It is far easier to draw the tubes, then sculpt them into the desired shape after the fact. I recommend the Infat and Pinch brushes at a low intensity setting for this. A low Z intensity setting will let you softly brush them repeatedly for gradual changes, rather than an abrupt change.

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If you sculpt the lines directly into the mesh with lazy mouse, then pressure sensitivity and a tablet will let you taper the stroke.

[untalmau]

i can not use lazy mouse because i will use separated each artery later on cinema 4D to give animation and change color on animation.
but i will try …
one more time …really thanks for your invaluable help.
really…thanks

[untalmau]

@Spyndel

It is far easier to draw the tubes, then sculpt them into the desired shape after the fact. I recommend the Infat and Pinch brushes at a low intensity setting for this. A low Z intensity setting will let you softly brush them repeatedly for gradual changes, rather than an abrupt change.

thanks again … really…
i use like you say …

1. Topologi Brush
2. Multi-tube brush and apply
3. sculp

now, please ,
How can I select those tubes, so that:
when applying, brush inflate or pinch, does not affect the surface (mesh)
just the green tubes, to be inflated and pinch ?
please brother ?

[untalmau]

any comment please… how select only green tubes to apply inflate and not to mesh please ?
any idea please.
i will apreciate so much.
thanks

[Spyndel]

The ways you protect geometry from being affected by an operation in Zbrush are:

1. Hide the geometry (much easier with Polygroups)

2. Mask the geometry (also much easier with polygroups)

3. Split the geometry into a separate subtool.

4. In this situation, Brush > Auto Masking > Topological Masking and Mask by Polygroups may also be useful.

These are fundamental Zbrush concepts. Everything you try to do in the program will be more difficult and take much longer if you have not learned the basics. Be sure to read at least the Getting Started section of the Zbrush documentation, and check out the Pixologic Classroom as well.