Houdini Solaris | Focus Camera Recipe

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Күн бұрын

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@stephanebourez 2 ай бұрын

Thanks for this Arvid, very cool. If anybody has a problem with crazy underscores showing up in their outliner's prim path, like at 5:48 with a warning on the node saying "Fixed Invalid USD Path" The way to fix it is to place the second expression 'Tick' after appending the focal geo string - or to not have it at all, but might as well close what we open : ) . Once this is done, you can see at 5:50 that the outliner prim path is clean and the warning on the node is gone. Drove me crazy for a handful of minutes ; )

@arvidurs 2 ай бұрын

Oh thanks for that. Is there something I should change in the scene files?

@stephanebourez 2 ай бұрын

@@arvidurs Pleasure. I don't have the actual scene file, but from the recording I'd say It's all good - I think Houdini is tolerant with not having the "closing" tick in the expression. So it works fine. Thanks for the cool videos man. 👍

@Jurgen_1657 4 ай бұрын

Thanks for making this tut, very useful! You can save it as a decorative recipe for the camera. Actually this kind of setups are perfect for 'decoration presets'. Thanks again Arvid!

@arvidurs 5 ай бұрын

Hope you're enjoying the Houdini content. More to come soon. Shading, Lighting, Multishot..and more

@unexpected_magic 2 ай бұрын

Thank you very much Arvid. This was really helpful. You could make your wrangle an asset, promote focus position and primitive path as channels and create a tranlslate handle. This way you only have one node and no objects that would contribute to the render process. Cheers, Ray

@PixelNinjaDesign 2 ай бұрын

Thanks for sharing. I hope you don't mind but I just wanted to point out a couple of issues with your approach. Firstly you're getting the local transforms, so this will only work when the camera and focus object share the same parent transform. So the world transforms would be preferable. Secondly, the point to point distance you're using here isn't quite correct. For focal distance you want the distance from the camera plane to the plane that the focus point lies on. Meaning you need to tranform the focus point into the cameras local space before getting the z distance. Here's an example: string cam_path = chs('camera_primitive'); string focus_path = chs('focus_primitive'); int focus_source = chi('focus_source'); matrix cameraTransform = usd_worldtransform(0, cam_path); matrix focusTransform = usd_worldtransform(focus_source, focus_path); vector focus_p = cracktransform(0,0,0,{0,0,0},focusTransform); focus_p *= invert(cameraTransform); usd_setattrib(0,cam_path, "focusDistance", max(-focus_p.z, 0));