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How to change rotation of objects in array

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Dalibor Kalna
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Hi there,

I try to replicate some effect and need to rotate simple objects in array according to luminance in the image. I have some example how to change the Y-position but can't figure it out how to rotate them. Any ideas?

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test_03.png (966.8 KB)
test_02.png (43.1 KB)
test_01.png (26.3 KB)

thank you and best regards
dalibor
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edward
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To rotate them, you need to set some attribute on the right input of the Copy SOP (ie. your grid) that controls orientation like “v” (3d velocity) or “orient” (quaternion).
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Dalibor Kalna
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hi edward,

thank you for your response. I have changed my network, so I do “Attribute from Map” (Cd as Float) and then I feed that to “Copy” node. The question is what should I write to Rotate-Y field in “Copy” node?

Attachments:
test_03.png (39.9 KB)
test_02.png (96.0 KB)
test_01.png (102.7 KB)

thank you and best regards
dalibor
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edward
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You don't have to change the Copy SOP because you already have rotate to template point attributes enabled. You just need to set it the point attributes on the grid to the thing that you want. Here's a simple example that just directly maps the color to “v” and the Copy SOP will pick that up automatically.

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texCopyRotate.hip (103.0 KB)

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Dalibor Kalna
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hi edward, you are great help for me and we are getting somewhere…

now it seems all my cubes are either straight or fully rotated, there is no smooth transition, like in image. I tried to play in VOP SOP using multiply node and with Remaping in “Attribute from Map”, setting contrast and scale, and contrast falloff, but nothing helped me. eventually I'd like to rotate the cubes from straight to what is in image, but I do not know what attribute shall I animate.

Attachments:
test_01.png (305.8 KB)
test_02.png (17.1 KB)
test_03.png (18.9 KB)

thank you and best regards
dalibor
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edward
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Then first do the greyscale mapping that you like, and then in a separate attrib vop sop, set “v” to what you want according to “Cd”.
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Dalibor Kalna
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great, thank you very much!
thank you and best regards
dalibor
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