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Simple light object instancing Feb. 8, 2017, 1:05 p.m.

I don't think you can instance lights in Houdini.

For the record, you can instance light in Houdini. Here is an example file and things to keep in mind.

-You need Full Point Instancing. Fast Point Instancing won't work.
-Even thought the Instance Object parameter is called “instancepath” the attribute you have to create per point is “instance”.
-You need to make sure your object containing all the instances is visible to Mantra as an object but you don't need to put it in the candidate lights. For example my workflow involves to not use Candidate Objects, I use Force Objects instead. For this reason I have to write my instance node there.
-You generally want to exclude the single light be instance from the center of the world by writing its name in “Exclude Lights”.

Hurricane on Saturn Nov. 27, 2015, 10:09 p.m.

The reason why the asset was not included was because it was for sale on Orbolt but oh well, I decided to give it. I think I sold only one in two years.

I usually make one hda per otl to better manage the versioning but since these tools are all meant to be used together it's all in the same otl.

So here it is


Hurricane on Saturn Nov. 25, 2015, 11:30 a.m.

This is in answer to a question on the mailing list asking how to achieve this kind of effect, see image attached.

I've made an quick test but I recommend for doing the real shot to have two sets of volumes because in the image we see two distinct level of density. Or one could make sure there is a nice contrasted level of density.

Also you could have a ramp that controls the variation based on the radius. This way you could decide where a ring becomes very dense.

I key to keep details even when the whole spiral has spun quite a lot is to add those small vorticle spin themselfves also deformed by the main spiral.

Let me know if you need more info/documentation in the hip file.