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About bonassus

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  1. pcopen with vex v.s. vops

    Oh, I guess that makes sense as it would have to import any data from those inputs right?
  2. pcopen with vex v.s. vops

    YES! that is exactly what i did. Thank you very much! also why does sidefx not just default the inputs to the cosponsoring inputs. this seems to make very little sense. maybe they fixed it for h17
  3. Attached are two screen grabs. One is a vops set up that works to convert @N to @v. The other screen grab is my failed attempt to recreate this with vex. what is wrong with the vex? Thanks!
  4. When setting a parameter value with VEXpressions for instance orbitspeed = orbitspeed. Is it possible to set orbitspeed upstream in a pop wrangle? there is no @orbitspeed on the geometry. So I guess this is not an attribute but a parameter value somehow accessible with set variables only in the VEXpression field. Thanks
  5. Using Point Position Dop with packed primitives

    Yeah, Okay thanks you.
  6. I'm trying to use the Point Position dop in a rbd packed object sim. Similarly to what is shown in this video. https://www.youtube.com/watch?v=mDkc2gU31sA but with packed objects. In the tutorial he uses the expression dopoption($DOPNET,$OBJID,"CopyInfo","copynum") in the Point Number field. This doesn't seem work on a packed primitives. I don't think there are values for the CopyInfo or copynum parameter. I have tried using @ptnum as shown in the attached screen. Is there a way to use the Point Position dop with packed primitives? thanks
  7. point expression for vector values

    Ah OK. thank you.
  8. I'm found this point expression point("../instance1",instancepoint(),"Cd",0) to access the value of the first index of the Cd vector attribute. However i can't find any reference to this usage of the point expression in the help files. the help shows point(geometry, string attribute_name, int pointnumber) with the attrib string as the second parameter and the point as the third. When there are 4 parameters it appears that 2 and 3 are swapped. this makes sense but is this shown in the help? thanks
  9. vdb from camera to polygons

    Ok it works. thanks for the help.
  10. vdb from camera to polygons

    Thanks for that. I at least now have density values in vdb activate. however convertvdb does not produce polygons. see attached image.
  11. I learned that you can create a vdb from the camera using the vdb node, set to "From Camera". This shows you the camera frustrum as a bounding area. I want to turn this vdb into polygons. my failure to do so reveals my lack of vdb knowledge. The vdb From camera tab is set to fog volume. I gave it a name of "density" and used a vdb activate to give a value of 1,1,1. I tried to use a convertvdb node to convert to polygons, this didn't work. i'm misunderstanding something here. help would be appreciated.
  12. printf

    Thanks a lot for your explanation. I think it should be added to the Houdini docs. much appreciated.
  13. printf

    I'm confused about printf. I don't know c++ and so never had to use it before leaning vex. I'm wondering about all letters you can use for the arguments in the printf function. I've seen %f used for a float. %d also used for float (decimal i guess), %s for string, and %i for integer. the docs state: The conversion of the argument is specified by a single letter: g, f, s, d, x, c, p. it goes on to show: %g, %p, %c Print an integer float, vector, vector4, matrix3, matrix or string in "general" form. %f, %e, %E Print a float, vector, vector4, matrix3 or matrix in floating point form. The first example shows 3 argument types and 7 data types. Does this mean i can use any of the listed %letter arguments with any of the data types shown?
  14. add spring to a lookat constraint

    That works. Thanks!