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diogomgf

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About diogomgf

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    Peon

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  • Name
    Diogo Ferreira
  • Location
    Lisbon
  1. Access "dead" attribute in a point

    I was reading some comments on how the @dead attribute generated by particle streams changes to 1 in the subframe before being reaped by the solver. Is there anyway to access this attribute after the simulation? For example, if I wanted to create a static point in that same position as the particle that is going to die? By the way, the generated particles are not from a POP Network, but yes from a FLIP simulation.
  2. Hello everyone! How would you go about making the bubbles generated from a whitewater sim to last a few frames on the surface of the fluid before being killed? Thanks, Diogo
  3. FLIP Collision and behaviours

    @djwarder Ok, will check that!
  4. FLIP Collision and behaviours

    @cudarsjanis Thanks alot for the clarification!
  5. FLIP Collision and behaviours

    Hello, I come from a Realflow background where you adjust the collision settings like roughness and bounce within the menus of the object of collision. In houdini there are 2 places where I see the same settings, and I don't know if both of them affect the simulation (if not, then wich one?): FLIP Object -> Properties -> Physical. Static Object -> Physical. In Realflow there was a parameter that easily let me escalate the intensity of the collisions, meaning that some objects would create bigger disturbance and higher splashes (not affecting the global forces on the scene). In Houdini I thought the equivalent was Velocity Scale on collisions, and I tried to change the value to 0 only to find out that not much changed in the splashes generated by the collisions... Any idea how to achieve this difference in intensity? Thanks
  6. FLIP Spray not colliding

    @Andrea Yup, it is...
  7. FLIP Spray not colliding

    Hello every one, I am doing a regular FLIP simulation where I have my particles colliding properly with a passive object. I have added a whitewater dopnetwork from shelf, and I re-created the collision setup in there. When I add foam and spray, everything goes as expected, but the spray just goes ballistic and completly ignores th collision borders. In the capture below you have an example of the overshooting particles (the ones making the correct form are the regular corefluid FLIP particles).
  8. Pyro FX density vs heat

    Hello, Does any one kno why the density field is being used as a binding for the threshold in the shape parameters of the pyro effect simulation once you use the "smokeless flame" preset? Its kind of weird that it takes density into account because density represents the smoke and we are trying to shape just the flames... Thanks, Diogo
  9. How does Pyro FX works?

    @Yon Thanks alot! I stumbled upon this explanation and I think it is the most in-depth quick guide on the abc's of Pyro (That is, without getting too technical):
  10. How does Pyro FX works?

    @Farmfield Thanks alot! I will have a look at those videos.
  11. How does Pyro FX works?

    Hello everyone, Does any of you know where can I find in depth knowledge of the pyro solver (I wouldn't mind the resources went further into math and implementation), its workflows and rendering pypeline? The documentation by sideFX is very poor in this case, and the tutorials on the subject are even worse (the usual -> "I think if you move this slider, it does this...") . Thank you, Diogo
  12. Volumesample and Volumegradient

    @Entropy Will do! Have seen many tutorials by them, but never this one in particular. Thanks alot. EDIT: Just watched the explanation part in the tutorial and everything is clear now.
  13. Hello, I was following a tutorial on how to create a sun in houdini, and I came across a technique used to keep advected points bound to the original surface where they were scattered from (in this case, a sphere). For the purpose of advecting the points, it was created a popnetwork with a curl noise affecting the velocity. To keep the points moving on the surface, the instructor did 2 things: -Turn the sphere into a mesh and convert it into a VDB. -Create a POP VOP, with a Volumesample and a Volumegradient, reading from the vdb converted sphere. After this, the gradient was inverted and multiplied by the output of the Volumesample node and added to the original positions, inputing into the new positions. This last point got me lost. The instructor referenced in some abstract drawings the utility of both this nodes, the Volumesample and Volumegradient and I tried to cross check with Sidefx's Houdini documentation but it didn't have that much info on the subject. Can some one briefly explain what is happening inside both this nodes, and their respective outputs? Thanks.
  14. Hello Houdini Users, I am new around the forum, and have been exploring the software for some time now. I come from a Realflow background, where I usually would go for an open domain Hybrido simulation and the particles could leave the container freely. Now confronted with the FLIP Tank workflow, I realized that the waterline option kills the particles at the boundary, instead of them rebounding (I always get some rebound with just waterline turned on), making it look like the container's walls don't exist above that certain waterline level. To avoid the loss of volume due to the killing of the particles,I turn the boundary layer on and it looks like it somehow replenishes the particles, but it generates artifacts that I can't comprehend: -Just turning on the boundary layer and leaving the padding at 0 makes it look like it is not working at all, thus I still loose volume and get some rebounds. -If i set padding values like for ex. 1 (in x and z) I get jittery particles around the boundarys. Could some one explain to me how is the Boundary Layer suppose to work (very briefly), most specificly the "Padding" options and in what context should it be used? Thanks, Diogo
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