Hi,
probably because animation always started on frame 1, look at any old dopesheet and it will start at frame 1. Also frame numbers and timecode are two different things with quite different histories. Nuke also starts on frame 1. Only programmers are weird and start counting at 0 ;-)
Best regards,
Fabian
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Houdini Lounge » Huge bugbear: why does Houdini default to start at frame 1, not zero?
- Fabian
- 127 posts
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Houdini Lounge » Thinking of moving from Rhino to Houdini
- Fabian
- 127 posts
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Hi,
I know both and they are not replacements for each other but can on occasion be used in a complementary way. Learning Houdini can be well worth it but not as a replacement for Rhino. Houdini is more intuitive and faster for some modelling stuff but Rhino's NURBS modelling tools are way more intricate and a bunch of the stuff you can do with Grasshopper is not replicable in Houdini.
A lot of Houdini's recently improved modelling tools are for poly modelling whereas Rhino is a pure NURBS modeller with a few mesh processing tools mostly for clean-up for printing. Be very aware of the differences here.
Forget stuff like sections, layouts, panelling tools, rhino cam, etc. and any of the Archicad and Revit live integrations as well as robust cad format interop. i/o like robust IGES, STP and DWG support. Also running data out for construction and documentation is not the same. For taking in data Houdini doesn't have a concept of layers like in cad programs and as such you will have problems taking in data with any level of complexity. Also unless something has changed recently, naming limitations will result in layer names to get screwed up if layers are named with something other than ascii characters making a roundtrip a royal pain (you need to break layers out into separate files before taking them to Houdini you want to stand a chance).
In your case you might look into writing some script to automate running through various settings for your sim in Rhino over night so you don't need to sit there trying values.
For processing/massaging point cloud or raw mesh data Houdini can be used nicely though. I've only done this in a one-way scenario where heavy geo-data came into Houdini for use in an animation and needed filtering and cleaning but there Houdini breezed through stuff I'm sure would have been a nightmare in Grasshopper.
Best of luck and happy learning,
Fabian
I know both and they are not replacements for each other but can on occasion be used in a complementary way. Learning Houdini can be well worth it but not as a replacement for Rhino. Houdini is more intuitive and faster for some modelling stuff but Rhino's NURBS modelling tools are way more intricate and a bunch of the stuff you can do with Grasshopper is not replicable in Houdini.
A lot of Houdini's recently improved modelling tools are for poly modelling whereas Rhino is a pure NURBS modeller with a few mesh processing tools mostly for clean-up for printing. Be very aware of the differences here.
Forget stuff like sections, layouts, panelling tools, rhino cam, etc. and any of the Archicad and Revit live integrations as well as robust cad format interop. i/o like robust IGES, STP and DWG support. Also running data out for construction and documentation is not the same. For taking in data Houdini doesn't have a concept of layers like in cad programs and as such you will have problems taking in data with any level of complexity. Also unless something has changed recently, naming limitations will result in layer names to get screwed up if layers are named with something other than ascii characters making a roundtrip a royal pain (you need to break layers out into separate files before taking them to Houdini you want to stand a chance).
In your case you might look into writing some script to automate running through various settings for your sim in Rhino over night so you don't need to sit there trying values.
For processing/massaging point cloud or raw mesh data Houdini can be used nicely though. I've only done this in a one-way scenario where heavy geo-data came into Houdini for use in an animation and needed filtering and cleaning but there Houdini breezed through stuff I'm sure would have been a nightmare in Grasshopper.
Best of luck and happy learning,
Fabian
Houdini Lounge » RFE: Input operators list "Mute Button"
- Fabian
- 127 posts
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I'd think that it would have to be addressed at the base UI code level no? Lists of input operators turn up on basically any OP that takes multiple input or not?
I'll write it up and submit it at the end of the week when I have a minute. Anyone else with a +1 please leave it here and I will include a link to the thread.
Best regards,
Fabian
I'll write it up and submit it at the end of the week when I have a minute. Anyone else with a +1 please leave it here and I will include a link to the thread.
Best regards,
Fabian
Houdini Lounge » RFE: Input operators list "Mute Button"
- Fabian
- 127 posts
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I've been playing with Houdini again for the first time in a while and I was just thinking that a mute button next to the re-arrange buttons in the various input operator lists (merge sop/chop. combine pop, etc.) would be mighty useful at times and save a lot of dis- and re-connecting. Has anyone else a RFE in for that already?
Best regards,
Fabian
Best regards,
Fabian
Technical Discussion » Multiple Monitor DragnDrop Bug
- Fabian
- 127 posts
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That bug has been there for a long time. I reported it a while back and it was logged I remember. I use the little arrow buttons for the material library, adding parameters, etc. instead of drag and drop. A bit annoying but workable.
-Fabian
-Fabian
Houdini Lounge » Quadro K5000 Mac Pro
- Fabian
- 127 posts
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Putting any money into an old mac pro is probably not a good investment at this point. Especially at Apple's inflated pricing for gfx cards. I have one too and am waiting for the new macpro to see which direction to go. For the money of the quadro you can probably get a new PC that will run circles around the mac for 3d.
-Fabian
-Fabian
Technical Discussion » linking L-systems
- Fabian
- 127 posts
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I suppose it might be a bit cleaner if you dumped the string into a spare parm on lsys1 and then just do a channel reference in lsys2. But yeah, nothing nice and in-built there. I think generally feeding lsys into each other via the additional inputs is a better way to go.
-Fabian
-Fabian
Technical Discussion » linking L-systems
- Fabian
- 127 posts
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While very dirty:
opinfo = hou.hscriptExpression('run(“opinfo /obj/geo1/lsystem1”)')
lsysStart = opinfo.find(“LSystem string:”)
lsysEnd = opinfo.find(“_______”, lsysStart)
return opinfo
this will grab the expanded string from one lsys and then you can have that in the premise parameter of the 2nd lsys. Remember to keyframe this since otherwise the python wont work in the string parm. Not sure if there is a cleaner way of doing this, maybe a custom expression function via the hdk could wrap this up nicer. There are some re-cooking issues so if you need it animated keyframe one of the rules on/off checkboxes in order to force string-reevaluation on the 2nd lsys.
Best of luck,
Fabian
opinfo = hou.hscriptExpression('run(“opinfo /obj/geo1/lsystem1”)')
lsysStart = opinfo.find(“LSystem string:”)
lsysEnd = opinfo.find(“_______”, lsysStart)
return opinfo
this will grab the expanded string from one lsys and then you can have that in the premise parameter of the 2nd lsys. Remember to keyframe this since otherwise the python wont work in the string parm. Not sure if there is a cleaner way of doing this, maybe a custom expression function via the hdk could wrap this up nicer. There are some re-cooking issues so if you need it animated keyframe one of the rules on/off checkboxes in order to force string-reevaluation on the 2nd lsys.
Best of luck,
Fabian
Technical Discussion » Alembic Facesets
- Fabian
- 127 posts
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I've been trying the same thing the other way round. I seem to be unable to import facesets from crate created alembic files? I see the path of what would be a faceset in the “Object Path” list but it still brings in the whole geo without selection.
Any suggestions?
Fabian
Any suggestions?
Fabian
Technical Discussion » Exporting RBD animation to 3Ds MAX
- Fabian
- 127 posts
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try: exocortex crate
they have alembic plugin that also support 3dsmax.
http://www.exocortex.com/alembic/alembic_for_3ds_max [exocortex.com]
Best regards,
Fabian
they have alembic plugin that also support 3dsmax.
http://www.exocortex.com/alembic/alembic_for_3ds_max [exocortex.com]
Best regards,
Fabian
Technical Discussion » Mercator projection
- Fabian
- 127 posts
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Hi,
you'll need to look for GIS tools. http://www.bluemarblegeo.com/global-mapper/ [bluemarblegeo.com] I have used before for something similar if I remember correctly. For one image $400 might be a bit steep though. Can't remember if the trial lets you save.
http://freegeographytools.com [freegeographytools.com] might be helpful. Have a look for MicroDEM also if my memory serves me right that has a bunch of re-projection features too.
Sorry if this is a bit inprecise but it's been a while since I needed something like this.
Best of luck,
Fabian
you'll need to look for GIS tools. http://www.bluemarblegeo.com/global-mapper/ [bluemarblegeo.com] I have used before for something similar if I remember correctly. For one image $400 might be a bit steep though. Can't remember if the trial lets you save.
http://freegeographytools.com [freegeographytools.com] might be helpful. Have a look for MicroDEM also if my memory serves me right that has a bunch of re-projection features too.
Sorry if this is a bit inprecise but it's been a while since I needed something like this.
Best of luck,
Fabian
Houdini Lounge » cmiVFX Martin Sawtell Directable Particles & Point Cloud
- Fabian
- 127 posts
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Sounds like a very interesting tutorial, however is that kind of condescending tone really necessary? Best regards,
Fabian
Fabian
NOTICE TO VIEWERS:
(*** This lesson is intended for professionals in a production environment or for those with aspirations to be such. Structure and techniques taught herein may cause cg dabblers minor depression and headaches. ***)
Houdini Lounge » Camera view and up vectors
- Fabian
- 127 posts
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Can't you just export the transformation matrix?
http://www.sidefx.com/docs/houdini12.0/hom/hou/ObjNode [sidefx.com]
There is a bunch of info there.
Best regards,
Fabian
http://www.sidefx.com/docs/houdini12.0/hom/hou/ObjNode [sidefx.com]
There is a bunch of info there.
Best regards,
Fabian
Houdini Lounge » Stop the camera from re-setting.
- Fabian
- 127 posts
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Hi, thanks for the reply but they don't work like undo-redo, it just cycles between cameras one has set up from what I understand (at least in H11).
What I'm talking about is when using hotkeys Space + {1 2 3 4 5} every time the view is totally reset. So eg. I'm tweaking some UV's I can't toggle between UV and perspective view using Space 1 and Space 5 so I can work full screen and see what I'm doing. Or going into side view to easily select certain points and go back to perspective to move the points there where they look best.
Roberts workflow is probably the best workaround. However it's a three step (Space+b, click on viewport you want maxed, Space+b) instead of a 1-step operation. No big deal in the grand scheme of things but a hassle and slowdown during certain situations. It's just little things like this and the half-broken snap tools for example that could be fixed with a minimum of effort compared to the other gargantuan things SESI manages to pull off and would make the everyday interaction smoother. But I guess most users are td's hacking away in the network and parameter panes most of the day in which case none of this matters much.
All the best,
Fabian
What I'm talking about is when using hotkeys Space + {1 2 3 4 5} every time the view is totally reset. So eg. I'm tweaking some UV's I can't toggle between UV and perspective view using Space 1 and Space 5 so I can work full screen and see what I'm doing. Or going into side view to easily select certain points and go back to perspective to move the points there where they look best.
Roberts workflow is probably the best workaround. However it's a three step (Space+b, click on viewport you want maxed, Space+b) instead of a 1-step operation. No big deal in the grand scheme of things but a hassle and slowdown during certain situations. It's just little things like this and the half-broken snap tools for example that could be fixed with a minimum of effort compared to the other gargantuan things SESI manages to pull off and would make the everyday interaction smoother. But I guess most users are td's hacking away in the network and parameter panes most of the day in which case none of this matters much.
All the best,
Fabian
Houdini Lounge » Stop the camera from re-setting.
- Fabian
- 127 posts
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Hi, yep there are ways around this but it's still a bit annoying not being able to use keyboard shortcuts to go between camera views without having to re-frame or switch tabs or minimize, move mouse over correct window in 4-window view and maximize again.
I assume the viewport code does not have a variable for remembering anything but the transformation of the currently active camera so as you switch it has to get re-initialized everytime the view is switched. I guess it can be added to the list of little bit of gui polish which would be nice to have.
All the best,
Fabian
I assume the viewport code does not have a variable for remembering anything but the transformation of the currently active camera so as you switch it has to get re-initialized everytime the view is switched. I guess it can be added to the list of little bit of gui polish which would be nice to have.
All the best,
Fabian
Houdini Lounge » Up vector explanation...
- Fabian
- 127 posts
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Hi,
in general terms an up vector helps define a frame of reference for constructing your rotation matrix. This can be used keep a characters knees pointed the right way or a particle aligned or keep a camera up-right or used as a basis for figuring out tangents on a curve, etc.
For example if you only have a point and velocity vector the using an up vector you can use cross products to get the rest. That up vector can either be a a constant like (0,1,0) or something you derive by other means such as position of a null. This isn't a great explanation but I hope it helps.
Fabian
in general terms an up vector helps define a frame of reference for constructing your rotation matrix. This can be used keep a characters knees pointed the right way or a particle aligned or keep a camera up-right or used as a basis for figuring out tangents on a curve, etc.
For example if you only have a point and velocity vector the using an up vector you can use cross products to get the rest. That up vector can either be a a constant like (0,1,0) or something you derive by other means such as position of a null. This isn't a great explanation but I hope it helps.
Fabian
Houdini Lounge » frustrating motion blur
- Fabian
- 127 posts
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Have you had a look in the details view to see if the velocity gets computed properly on the split particles?
Otherwise it's always helpful if you post a hip file.
-Fabian
Otherwise it's always helpful if you post a hip file.
-Fabian
Houdini Lounge » Autocad into Houdini help
- Fabian
- 127 posts
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I can second Kuba's experience with Rhino. That has worked very nicely on one occasion if I recall correctly.
-Fabian
-Fabian
Houdini Lounge » Autocad into Houdini help
- Fabian
- 127 posts
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I think Autocad r12 dxf is the only thing you can bring into houdini. Maybe r13 but basically explode everything and clean up your autocad file. Make things as simple as possible. Also make sure that if its archtectural stuff its not done in some global coordinate system where everything lives a few million units off to one side or the other. That's all I can remember off the top of my head, been a while since I tried this. I would guesstimate the any hatches needs to be converted to lines also.
Best of luck,
Fabian
Best of luck,
Fabian
Technical Discussion » How to match motion blur with softimage??
- Fabian
- 127 posts
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