chang Posted April 22, 2003 Share Posted April 22, 2003 Hi, It seems i3d-generated clouds are not casting a shadow on the ground. Am I missing something ? Or is it impossible ? Thanks in advance Quote Link to comment Share on other sites More sharing options...
AndrewVK Posted April 22, 2003 Share Posted April 22, 2003 I think its imposible with 3D Texture Fog "atmosphere" shader because atmosphere shader is carried out after surface shader has finished. Try 3D Texture Cloud "surface" shader. Quote Link to comment Share on other sites More sharing options...
chang Posted April 22, 2003 Author Share Posted April 22, 2003 Thanks Andrew It's just beautiful. Quote Link to comment Share on other sites More sharing options...
AndrewVK Posted April 22, 2003 Share Posted April 22, 2003 If i3d texture was not generated from metaballs, than the size of 3d texture would usually be a little bit larger than the size of the object it was made off. That is why you can loose details if you assign this shader to the object directly. If it has happened you could use the following scheme: "Source of i3d" SOP -> Box SOP -> XForm SOP (scale a litle bit) -> Shader SOP Quote Link to comment Share on other sites More sharing options...
chang Posted April 23, 2003 Author Share Posted April 23, 2003 Wow, thanks again ! Andrew. -- (Above is fog. Below is surfaceShaded. With same option) Quote Link to comment Share on other sites More sharing options...
chang Posted April 23, 2003 Author Share Posted April 23, 2003 oops, I forgot the attachment Quote Link to comment Share on other sites More sharing options...
thrasherstudios77 Posted April 23, 2003 Share Posted April 23, 2003 Hi Chang Really cool looking clouds, i didn't quite understand AndrewVK explaination of how to get the clouds casting shadows "Source of i3d" SOP -> Box SOP -> XForm SOP (scale a litle bit) -> Shader SOP a hipc file of the cloud torus would be very helpful, i am trying the same type of effect and can never get my clouds to cast shadows either. Later Ben Quote Link to comment Share on other sites More sharing options...
chang Posted April 23, 2003 Author Share Posted April 23, 2003 ..It's strange uploading is not allowed by the maximum-file-size.. My file is just 83k, the maximum is 153k. Thrasher, give me your email address, I'll send it to you. Quote Link to comment Share on other sites More sharing options...
Wolfwood Posted April 23, 2003 Share Posted April 23, 2003 You can download Chang's example here. Thanks for the example Chang. jim. Quote Link to comment Share on other sites More sharing options...
AndrewVK Posted April 23, 2003 Share Posted April 23, 2003 Still there are some limitations... The standard 3D Texture Cloud "surface" shader works incorrectly in case if "Object Inside Cloud" (because of Z-Sorting). 3D Texture Fog "atmosphere" shader does not have this limitation, but it cannot cast shadows. IMHO: I think it is possible to rewrite the shader to handle "Object inside" and/or/both "Camera inside" situations, though it would work slower. Quote Link to comment Share on other sites More sharing options...
Bernard Posted July 31, 2005 Share Posted July 31, 2005 I think its imposible with 3D Texture Fog "atmosphere" shaderbecause atmosphere shader is carried out after surface shader has finished. Try 3D Texture Cloud "surface" shader. 5871[/snapback] Hello, How did you do the cloud with surface shader. To what must you connect the surface shader if there is no Atmosphere node. I don't get my shadows like in the example picture. Any help is welcome. thx Quote Link to comment Share on other sites More sharing options...
AndrewVK Posted July 31, 2005 Share Posted July 31, 2005 Here an example Houdini 8.313 cloud.zip Quote Link to comment Share on other sites More sharing options...
Bernard Posted July 31, 2005 Share Posted July 31, 2005 Here an example Houdini 8.313 20056[/snapback] Thanks AndrewVK for the scene file. Now I understand the set-up. I must say this Houdini forum is top-notch, with helpfull and friendly people. Maya users , eat your heart out. Houdini rocks! Thanks, thanks , thanks... bernard Quote Link to comment Share on other sites More sharing options...
Bernard Posted August 1, 2005 Share Posted August 1, 2005 Thanks AndrewVK for the scene file. Now I understand the set-up.I must say this Houdini forum is top-notch, with helpfull and friendly people. Maya users , eat your heart out. Houdini rocks! Thanks, thanks , thanks... bernard 20057[/snapback] Hello, How can I cast shadows ON the cloud (example: like cloud behind a wall -see pictures from chang) thx, bernard Quote Link to comment Share on other sites More sharing options...
AndrewVK Posted August 1, 2005 Share Posted August 1, 2005 Just turn "Object Shadowing" parameter ON (VEX 3D texture Cloud shader) Quote Link to comment Share on other sites More sharing options...
Bernard Posted August 1, 2005 Share Posted August 1, 2005 Just turn "Object Shadowing" parameter ON (VEX 3D texture Cloud shader) 20068[/snapback] Thanks AndrewVK. bernard Quote Link to comment Share on other sites More sharing options...
Szymon Posted August 1, 2005 Share Posted August 1, 2005 Hey Andrew? or anyone out there? Do you guys have any examples of creating volumentrics using pointcloud? It's still mystery for me and would like to learn something about it. Quote Link to comment Share on other sites More sharing options...
AndrewVK Posted August 1, 2005 Share Posted August 1, 2005 I have no such an experience..but i am 100% sure...PCloud will work just fine without I3D at all. Better or no...i dont know...but faster Especially after new functions for work with metaballs have appeared. metamarch...metaimport...metaweight etc. Quote Link to comment Share on other sites More sharing options...
Szymon Posted August 1, 2005 Share Posted August 1, 2005 Any examples at all? I have not touched poin clouds at all. I know there is some technique to use poin clouds replacing i3d completly, but I can't find any informations about it. I don't even know where to start. Quote Link to comment Share on other sites More sharing options...
AndrewVK Posted August 2, 2005 Share Posted August 2, 2005 U can start from here http://www.sidefx.com/exchange/info.php?fi...8&versionid=208 Quote Link to comment Share on other sites More sharing options...
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