Thank you! Really cool :)
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*From:* softimage-boun...@listproc.autodesk.com
<softimage-boun...@listproc.autodesk.com> on behalf of Christopher
Crouzet <christopher.crou...@gmail.com>
*Sent:* 02 March 2017 13:25
*To:* Official Softimage Users Mailing List.
https://groups.google.com/forum/#!forum/xsi_list
*Subject:* Re: [Houdini] Working with strands the Softimage way
If it can help, here's a basic scene showing one common approach for
making strands: https://filebin.net/6ml27y3atb6qd7iq
<https://filebin.net/6ml27y3atb6qd7iq>
On 2 March 2017 at 20:17, Tim Bolland <tim_boll...@hotmail.co.uk
<mailto:tim_boll...@hotmail.co.uk>> wrote:
Thank you Andy that's a really helpful summation, I'm going to
give it a go :)
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*From:* softimage-boun...@listproc.autodesk.com
<mailto:softimage-boun...@listproc.autodesk.com>
<softimage-boun...@listproc.autodesk.com
<mailto:softimage-boun...@listproc.autodesk.com>> on behalf of
Andy Nicholas <a...@andynicholas.com <mailto:a...@andynicholas.com>>
*Sent:* 02 March 2017 13:12
*To:* softimage@listproc.autodesk.com
<mailto:softimage@listproc.autodesk.com>
*Subject:* Re: [Houdini] Working with strands the Softimage way
Just to confirm how I'm thinking about this, a strand in Houdini
is typically made up of point positions, not points with arrays
as attributes. You can manually add an attribute to each point
position to say which strand it's part of, there's a node that
generates lines that will then understand this?
What I'm saying is that's something you can implement yourself.
There are no nodes in Houdini that understand a point with a
vector array is a strand, and no shaders that will do that
automatically either. Again, you can build that yourself if you
like, but it's quite advanced if you're going to be delving into
procedural geometry shaders.
Otherwise you can create polyline primitives and feed point IDs
into it. This will generate a polygon line (polyline) between
the vertices in the primitive, and in some ways this is just
like the point[pointarray] technique.
Yep. A polyline is nothing special. Just an unclosed polygon. As
others have pointed out, you can apply attributes to the points
to set things like width and color. Or you can use something like
the PolyWire SOP to generate your own rendertime geometry.
The key is how do you create these point clusters and the order.
In ICE I would make strands using a build linearly interpolated
array with two vectors feeding into it. I guess I could try and
recreate this using vex/vops, and maybe that's what I'm after, I
just need to find a way to manipulate all these points in the
right order.
Easiest way (assuming you already have some animated points) is
to use the Trail SOP with it set to "Connect as Polygons", turn
"Close rows" off, and set "Trail Length" to something like 10.
Next stop after that is to take a look at the Resample SOP.
Especially the "Treat Polygons As" parameter, as that'll let you
create interpolated shapes to your trails which is kind handy.
A
On 02/03/2017 12:58, Tim Bolland wrote:
That's a good point Andy, and in my mind this would make the
most sense! But like you say maybe not the most supported.
Just to confirm how I'm thinking about this, a strand in Houdini
is typically made up of point positions, not points with arrays
as attributes. You can manually add an attribute to each point
position to say which strand it's part of, there's a node that
generates lines that will then understand this?
Otherwise you can create polyline primitives and feed point IDs
into it. This will generate a polygon line (polyline) between
the vertices in the primitive, and in some ways this is just
like the point[pointarray] technique.
The key is how do you create these point clusters and the order.
In ICE I would make strands using a build linearly interpolated
array with two vectors feeding into it. I guess I could try and
recreate this using vex/vops, and maybe that's what I'm after, I
just need to find a way to manipulate all these points in the
right order.
I'm rambling a bit here, but hopefully getting somewhere!
Cheers,
Tim
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*From:* softimage-boun...@listproc.autodesk.com
<mailto:softimage-boun...@listproc.autodesk.com>
<softimage-boun...@listproc.autodesk.com>
<mailto:softimage-boun...@listproc.autodesk.com> on behalf of
Andy Nicholas <a...@andynicholas.com> <mailto:a...@andynicholas.com>
*Sent:* 02 March 2017 12:27
*To:* softimage@listproc.autodesk.com
<mailto:softimage@listproc.autodesk.com>
*Subject:* Re: [Houdini] Working with strands the Softimage way
Hi Tim,
Did you notice that you can do per-point array attributes in
VEX? There's nothing stopping you setting up position vector
arrays on each point, just like in ICE, and then using a Point
Wrangle at the end to use that array to generate a polyline. The
problem is that you then have to write all those handy ICE nodes
like "Simulate Strands", etc. yourself.
That's why generally, you're better off just trying to use
polylines as a primitive as they're more supported by Houdini's
other frameworks (e.g. wire solver) and constraints.
A
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