Nicole Kennedy Design

Ideation, Creation & Everything In Between

Houdini Galaxy Tutorial – Part Three

The next stage in the tutorial is to create a VOPPOP which is done by using the tab menu and typing in Vop and placing the node in the network view I then have to connect the VOPPOP to the source node and the orbit node as shown in the image below. Screen Shot 2014-03-11 at 12.10.05The next stage is to go into the voppop by default there is a global and output node but I now need to create a constant node which achieved by using the tab menu and typing in const and placing the const node in between the global and output nodes. I also learnt a new trick about parameters before I was clicking on the node and navigating to the top of the screen where to parameters would normally appear but if I press the P key a mini window like the one shown below is displayed over the network view so that I can quickly change a parameter and move on. Screen Shot 2014-03-05 at 12.46.13In the image below is the mini paramater window that is shown when I press P on the keyboard what I want to do with the constant node is to edit the constant type and change this from Float (float) to 3 Floats (vector). Screen Shot 2014-03-05 at 12.47.12

I need to change the values of the 3 Float Default to 1, 2 and then 3 and connect the value segment of the constant node to the value segment of the output1 node. Screen Shot 2014-03-05 at 12.47.56The next stage is to create a cross product node which is done by pressing tab and typing in cross and selecting the cross product node and placing the node on the network view. I then need to connect the position (P) segment of the global1 node to the vector1 (vec1) of the cross product node. I then need to connect the cross segment of the cross product node to the value (v) segment of the output1 node. Screen Shot 2014-03-05 at 12.50.41

This video shows an example of how the simulation looks with the cross product node in place.

The next stage was to add more nodes to the network to start with I added a normalize node using the tab menu which appears as normalize1 in the network view I then went on to add a length node yet again by using the tab menu which appears in the network view as length1.  As I placed the normalize node betweent he crossproduct (cross1) node and the ouput node it connects to the values that previously were connecting cross1 and output. The length node was then connected from the cross segment of cross1 to the vector (vec) of length1.

Screen Shot 2014-03-05 at 12.55.17

This video then shows the effect that the normalize node has on the simulation.

In the image below I am still on the network view of the VOPPOP and I need to place a multiply node between the normalize and output1 node. I then need to connect the len segment of the length node to the (input2) second input of the multiply node.

Screen Shot 2014-03-05 at 12.56.02In the image below is a full preview of what the VOPPOP now looks like and I need to include a distance node that will connect to the P (position) segment of the global1 node. I then need to place down a fit node using the tab menu and connect the dist (distance) segment of the distance node to the val (value) of the fit node. The final step is to then connect the shift segment to the input3 of the multiply node. Screen Shot 2014-03-05 at 12.59.43In the VOPPOP on the fit node I then have to promote the following parameters srcmax, destmin and destmax in order to promote the parameters I middle mouse click on the green box with the arrow of the relevant segments and this promotes the parameter. Screen Shot 2014-03-05 at 13.15.26 In the image below you may notice that each parameter has a name and label. I then have to change the name of the label to Max radius which is done by clicking on the label and typing in the text box.Screen Shot 2014-03-05 at 13.23.14


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This entry was posted on March 11, 2014 by in Creative Solutions, Galaxies, Houdini and tagged .
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