John Brown


About Me

United Kingdom


Recent Forum Posts

Protein Database files (.PDB) and Houdini. March 30, 2019, 7:18 a.m.

Hey signore madrenderman

you might find this thread interesting []

It might be a bit old now though and I went about connecting them in a very convoluted way. learned a lot though.

When I revisited this a few years later I found that using the ‘connectadjacentpieces’ sop and connecting by points was the quickest way to bond them. Just scale up and down the search radi until they connect correctly .

your probably beyond this but for the sake of the thread - modelling the sop way would be to use ‘group’ and ‘colour’ sops to colour them.
And ‘create attribute’ sops to set Pscale.
Or use ‘VOP’ or ‘wrangle’ nodes to set these attributes.

Then feed them all of those coloured and scaled points into a ‘copy to points’ sop, with a ‘metaball’ or ‘sphere’ plugged in the other side.

I got a bit stuck with mantra and rendering transparency and colour with objects inside objects, which you are likely to do for rendering molecular models. You can set the surface priority - look up absorption and nested dielectrics for this.
After revisiting this I think the problems I was having with nested dialetrics might have been caused by my scene scale.
Please let me know if you get some nice renders working with this look.

Also data wise - look out for miscellaneous water atoms H and O, and sometimes the data provides alternative configurations.
you might have to group and delete a few things to clean up before modeling the points.



MapBox imagery resolution? Jan. 17, 2019, 5:30 a.m.

Hey Terence I'm wondering exactly the same thing.

I think the image resolution parameters must be written into some referenced code somewhere. There are some references to a python module as you would expect, and further to a mapbox url with code.

I had a look at downloading imagery in ‘mapbox studio’ as the resolution options are higher there at the same zoom level.
But the lat lon zoom parameters do not line up with the mapbox houdini nodes parameters.



Portal interior lighting and noise March 20, 2017, 11:50 a.m.

Thanks again everyone for your input.
I've been researching a few other possible renderers and still finding this interior scene difficult to rid of noise so not just a mantra thing

While looking at renderman I came across a good article that seems very clear about adaptive sampling and using min and max samples. check it out. I guess the values suggested shouldn't correspond but the theory should don't you think ? []