jon3de Posted November 16, 2015 Share Posted November 16, 2015 Hi, I have this simple smoke setup. Its a Fluid Container with an emitter and a collision object. How can I control the direction of the emitter and its strength / speed what it uses to emit the smoke? At the moment the emitter just emits the smoke which is falling to the ground. I want it to emit the smoke with a certain speed and in one direction. Its for a rocket propulsion. ( I follow a tutorial from Rohan Dalvi and just stopped at the smoke part to test some things out ) Unfortunately I did not manage it by my own so I would be thankful for some help. I thought it should be controlled by the "source volume" node in the dop network. Here I tried some stuff with the "Scale Velocity" slider which has no effect. The "Fluid Source" sop in the emitter geo did create two scalar volumes : density and tempererature. Is there maybe a velocity attribute missing? Of course I do not know if its just the wrong way to set this effect up like this. Maybe I have to use Particle to control the direction? Again I would be thankful for some tips. kind regards Jonathan SmokeTest.hipnc Quote Link to comment Share on other sites More sharing options...
Skybar Posted November 16, 2015 Share Posted November 16, 2015 The "Fluid Source" sop in the emitter geo did create two scalar volumes : density and tempererature. Is there maybe a velocity attribute missing? There is a Velocity tab here that creates a vector volume for velocity. 1 Quote Link to comment Share on other sites More sharing options...
jon3de Posted November 16, 2015 Author Share Posted November 16, 2015 Yes I saw that. But when I check the node with MMB the verlocity vector volume is not listed. Assumed there is a vector volume, I have to manipulate that in the dop network is that right? Can you tell me where exactly because I cant find it. The Scale Velocity slider does not change anything. Jon Quote Link to comment Share on other sites More sharing options...
gui Posted November 16, 2015 Share Posted November 16, 2015 there isn´t a "v" attribute in the source geometry. In that case, you should toggle the "add velocity" on in the "create_density_volume" node, in sops. SmokeTest2.hipnc 1 Quote Link to comment Share on other sites More sharing options...
jon3de Posted November 16, 2015 Author Share Posted November 16, 2015 Oh my god ok....now I have it. There has to be a "v" attribute before the "create_density_volume" sop. This is used for the velocity volume. Sorry houdini is still a little bit puzzling for me. But I slowly fall in love thank you for your help! Jon Quote Link to comment Share on other sites More sharing options...
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