calin_casian Posted November 4, 2003 Share Posted November 4, 2003 I'm in some sort of a trouble understanding how parenting at the /obj level works. I have one null parented to another one. the translation attr. of child null are use to modify some points in another object (something like a cluster). Now, my problem is that when I move the parent null the child null moves with him but not the points from the other object. Maybe that it's solvable using channel reference between the parent and child but what about the case when I need to constrain the child null to another 2 nulls with a blend op. which channel from blend op needs to be referenced so that my child null will drive the points from the other object. for ex. null1 and null2 goes into a blend op with weight 0.5 and the null3 is a child of blend op. now the null3 moves along with the blend but the points not (((( plz. can someone explain to me how I can solve this out. thx calin Quote Link to comment Share on other sites More sharing options...
tallkien Posted November 4, 2003 Share Posted November 4, 2003 Your cluster is at the sop level and knows nothing about whats happening at the object level. Object merge something somewhere I think, will need to try it out Quote Link to comment Share on other sites More sharing options...
calin_casian Posted November 4, 2003 Author Share Posted November 4, 2003 I think the problem could be solved if the translation of the child null can be modified as well by some sort of parameter of the blend or other. now when you move the parent the child translation remains the same and even if I do a obj merge I don't think it will work because the transformation of the child are still 0. I'm a beginner in houdini and maube I think wrong. Quote Link to comment Share on other sites More sharing options...
michael Posted November 4, 2003 Share Posted November 4, 2003 when you move the parent object the child object IS NOT moving...it remains in the same position 'relative' to it's parent look into the origin (and related) functions on how to get the values from OBJ into SOPs Quote Link to comment Share on other sites More sharing options...
tallkien Posted November 4, 2003 Share Posted November 4, 2003 I too think the cluster needs to reference the blend rather than the child null, and don't worry i'm a newbie too Quote Link to comment Share on other sites More sharing options...
anakin78z Posted November 4, 2003 Share Posted November 4, 2003 here's what you do. Go into chops and put down an object chop. specify the null you're concerned about, and specify another object that is at 0,0,0 as your reference object. The chop will calculate your real world position. you can now grab those values and use them in your reference, instead of the null values. Quote Link to comment Share on other sites More sharing options...
calin_casian Posted November 5, 2003 Author Share Posted November 5, 2003 thx guyz, I'll try the CHOPS method. Anyway I did find some math formulas of calculating position based on weight (something like a blend tool but will actualy update the transforms, like it gets it's values acording to world space, not to relativ) so I'll give a try and make an OTL thx calin Quote Link to comment Share on other sites More sharing options...
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