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Technical Discussion » Redshift Pyro and GI intensity control workflow

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Enivob
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I don't think material emission can actually light a volume. What you might need to do is convert those objects on the side of the screen to a mesh (VDBConvert set to polygons), to use them as a mesh light. Then you will have have a Volume Contribution field (which defaults to 0) that you can increase to illuminate the central volume.
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Technical Discussion » Render Window actual resolution?

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Enivob
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Try SPACE-G with your mouse inside the window that you want to “GO” to home.
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Technical Discussion » Crowds - Link agent layers to states

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Enivob
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Check out the Learn menu, up above. Select tutorials and then choose category Crowds. There is a video on how to setup Agent layering.
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Technical Discussion » Exporting Soundkeys data from AE to Houdini

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Enivob
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Just use the Houdini CHOPs network to read the same audio file. There is no need to transfer data between apps.
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Technical Discussion » Strange behaviour of velocity trail in VDB from particles

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Enivob
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Yep, that's broken. Submit that file to support@sidefx.com. You have found a bug.
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Houdini Lounge » Geometry Spreadsheet select points from sheet to scene?

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Enivob
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See that little button next to the question mark, in your posted image? Click and hold that until a menu appears. Move to the bottom of the menu and activate “Auto” This will link your selection automatically between the spreadsheet and the viewport.
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Houdini Indie and Apprentice » Scene doesn't render anymore.

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Enivob
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Try rendering again. I often get stuck at Generating scene. Sometimes just issuing another render brings it up.

BTW it's been that way for years.
Edited by Enivob - Jan. 11, 2020 10:02:53
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Technical Discussion » Renderman 23 Material SOP?

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Enivob
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Try dropping an AssignMaterial node after the MaterialLibrary. Make sure to click the AutoPopulate button on the material Library. This will make your materials appear in the USD Scene Graph. From there you can drag/drop your mesh and materials onto the AssignMaterials node.
Edited by Enivob - Jan. 10, 2020 10:00:13
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Technical Discussion » Reset original Houdini nodes (digital assets)

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Enivob
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Yeah, never unlock and re-save a system HDA that ships with Houdini.

I think the fix I used on Windows was to locate the current version of the Houdini18.0 folder, under My Documents and moved it to the desktop. Then launch Houdini again. When Houdini finds no folder exists, it will recreate the folder structure and restore the original node's functionality.
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Houdini Lounge » recommended RAM for simulation in houdini

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Enivob
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Ram is used to increase the quality or count of the simulation, not make it faster.
16Gb is not enough IMHO. You will be able to run through basic setups, however, which is nice to get you up and running on the process. I would consider 32Gb the lowest amount of RAM to begin simulations.

Actually having more RAM may make your simulations run slower. As you increase the resolution, you increase the simulation time.
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Technical Discussion » Randomly choose between mutliple source objects for Greeble

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Enivob
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What about something like this….
Construct a string attribute that randomly programs the ObjectMerge.
Construct a random part for each primitive using VEX.
int index = int(fit01(rand(@primnum+ch("seed")),1,7));
s@obj_path = sprintf("/obj/GreebleObjects/grid%d",index);

Reference the attribute using the hScript prims function.
`prims("../foreach_begin1/",0,"obj_path")`
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Technical Discussion » Houdini 17.5 - OpenCl flip fluids not kicking in

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Enivob
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No, OpenCL only works on limited resolutions. Most vRAM is not large enough to hold a decent simulation. You may have set your FLIP resolution too “high” with a low particle separation. When this happens Houdini politely degrades to CPU calculations, instead of GPU calculations. This make OpenCL more of a “toy” to play with, rather than a production acceleration tool.

How are you monitoring your GPU usage?
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Houdini Indie and Apprentice » Hide pop object until it collide with the grid

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Enivob
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You could try setting the @Alpha attribute based upon hitnum. It might not hide it in the viewport, but with the correct material, it should work for the render.
f@Alpha = 0.0;
if (@hitnum>0) {f@Alpha = 1.0;}

Otherwise, perhaps try carving the line based upon the hit count..?
Edited by Enivob - Dec. 20, 2019 09:22:40
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Houdini Indie and Apprentice » Attach node automatically when creating?

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Enivob
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I think you need to hold down shift and when you press ENTER after locating a node from the TAB menu list.
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Technical Discussion » Arnold and Redshift

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Enivob
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My guess, is that you have to modify the houdini.env file, located in the Houdini folder of your home documents to point to the correct paths where you have installed each render engine. Consult those forums/documents for support on how to set this value.

I have successfully enabled Renderman and Redshift on the same machine, but I don't use Arnold.
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Houdini Indie and Apprentice » Viewport viewing/zooming/collision(?) issues?

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Enivob
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Yeah, Houdini has some of the worse viewport clipping defaults of any 3D program I have used. It is annoying.
Move your mouse into the 3D window and press the D-KEY to bring up the display options. Somewhere in there is viewport clipping option. Set the near to a small number like 0.001 and set the far to a large number like 10,0000. You may need to set it even higher, if you are working with large geometry, like a city, for instance.

Once you lock to a camera or look through a camera, the clipping is taken from the camera object, not the display settings.
Edited by Enivob - Dec. 16, 2019 09:51:53
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Technical Discussion » Paint Brush not working

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Enivob
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Like many of the nodes in Houdini, you may need to select it in the network view, move your mouse into the 3D window and press the ENTER key to activate the particular functions of that node. The Paint node is like this.
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Houdini for Realtime » .obj save geometry merges all meshes?

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Enivob
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The merging may be due to all the faces having the same material. Houdini .OBJ output does not seem to forward the assigned material information into the exported .obj file format. The file format does support such features. You can re-write the .OBJ file, on export to add this functionality.

The code basically detects if the 'g' token exists. If it does, it inserts a new token 'usemtl' which many importers look for in breaking up the .OBJ.

There is a thread here, that discusses this.
https://forums.odforce.net/topic/25214-post-processing-an-export/?do=findComment&comment=146948 [forums.odforce.net]
Edited by Enivob - Dec. 11, 2019 09:49:25
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Technical Discussion » How can I convert a curve into a path with python

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Enivob
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I don't think there is any difference between a curve and a path. In Houdini, a path is a list of string characters that points to a file. A curve is a set of points that is connected with edges.
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Technical Discussion » Crowd firing weapon mutual relation

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Enivob
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You can drop some code into a Primitive wrangle and extract the bone points, without unpacking.
matrix prim_xform = primintrinsic(0, "packedfulltransform", @primnum);
for (int i = 0; i < agenttransformcount(0, @primnum); ++i)
{
    matrix world_xform = agentworldtransform(0, @primnum, i) * prim_xform;
    addpoint(0, set(world_xform.wx, world_xform.wy, world_xform.wz));
}
You could use a bone for the weapon and position the tip of the bone at the end of the weapon. This could get you a firing point. I'm not sure how to link triggering from a crowd sim to a standard particle system emission. Perhaps you'd have to run the entire crowd simulation through a full timeline time shift, then present the resulting firing points as an emitter source for the particle system.
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