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Showing results for tags 'object mask'.
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I'm new to Houdini, transitioning from Max(TP, pflow, Magma...etc.). I started by messing around probably how everyone else did by using the shelf tools. However, I'm now trying to really dive into it using the application as it is intended. I figured that I would start off with a very straightforward and simple example from scratch - NO SHELF TOOLS. What I did first was actually create what I intended to make using the shelf tools first and then see what was going on and then start from scratch. In my example I just want to Have a Torus fall and have particles emit off the surface as it falls. The Rigid Body part is working perfectly, but the POP part of it is where I'm having problems. As soon as I add POPS into the mix (even if I make a different DOP network) I keep running into the problem that the particles seem to emit from a "ghost" of the torus geometry. One thing I noticed and can't seem to find an answer for are these 3 things. When I use the shelf tool to emit particles from the surface, it fills in information into the "DOP Import" Node that it creates. The information is created in the Object Mask of the node. I can't seem to find what an Object Mask actually does (I'll revisit this later). The shelf tool creates a SOP node with a DOP I/O and I don't know why. When using the shelf tools to make this setup, I noticed that If I deleted the information that was in the Object Mask of the DOP Import node at the end of the tree, the particles in the DOP Network wouldn't work at all. To revisit, what I was saying previously - I don't know what an Object Mask does/is for, and the information that was added when using the shelf tool route looked incredibly arbitrary to me. I included some images of my basic setup. Here is the top level Object view: You can see what I'm talking about where the torus falls, but the particles are emitting from the "Ghost" geo. This is where I suspect something is wrong, If I had to guess, the Object Mask has something to do with saying to use the geometry but not interfere because it's a mask? (I have the DOP Import node set to Bypass so that everything would show up.) And lastly, here is my DOP tree. When I select the Torus SOP this is what happens. But with the shelf tools, it used info in the Object Mask as the SOP Path. I know this is super detailed for such a simple setup, but I'm trying to understand what I'm doing and also what/why Houdini is what it is. Any and all help is much appreciated as I've been looking for an explanation to this for well over a week. I look forward to having that moment when it all clicks. Thanks! -Stark -
Hi all, I did a water sim yesterday of a flipfluid pouring over an object. I saved out a .sim cache of it with a rop in the DOP network. When I brought the .sim back in with a file SOP, there was both the particles and the collision object. I only needed the particles and so I tried using the 'object mask' in the file SOP. Eventually ' flipfluid* ' worked for me; keeping only the particles and not the other object. But how can I query the .sim file to know what objects are inside it? I looked through the 'Details View' and also MMB on the file node. Couldn't see any mention of objects? 'cheers, Sim.
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