What Chris suggested below works for rotating a crystal structure to match those crystals in a tiff image in the same window. Initially I had both the tiff image and crystal structure in an Image window but it was taking too long to render everything each time I rotated just the structure. Then I used Render, Arrange and Display to display them and it works faster.
Thanks for your help. Susan Schwarz Academic Computing Dartmouth College --- Chris Pelkie wrote: >We want to display an image as the background, then place a ball and stick >crystal shape on top of it, rotate the crystal to match the image, then >read out the axial positions. Is this possible in dx? > Yes. Import a TIFF or similar and the 3D object using a ReadImage and an Import. >Specifically, is there a way to rotate the crystal without rotating the >background? How do I get the transformation matrix that is used when I >rotate the crystal using the Image module? > Image is moving the camera, not the object(s). It's much easier to apply a Rotate (and Scale and Translate) modules only to the object you want to transform (the ball and stick). Keep Image still, probably front facing initially. Attach interactors (Scalars or Vectors) to the Rotate/Scale/Translate inputs and fiddle til the ball and stick lines up. Now when you move Image's camera, you can pan around the aligned TIFF/3D object scene. If you really want it you can get the current Image camera out of Image's 2nd output, but inverting the transform is more trouble than it's worth. Chris Pelkie Vice President/Scientific Visualization Producer Conceptual Reality Presentations, Inc. 30 West Meadow Drive Ithaca, NY 14850 [EMAIL PROTECTED] --- end of quote ---
