Geomview For Windows?
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[wanderst at yolanda.hper.indiana.edu: geomview transparency]
X-Mailer: Z-Mail (3.1.0 22feb94 MediaMail) To: munzner at geom Subject: geomview transparency Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 Hi, I'm trying to use the "transparent" button on the Materials panel in Geomview. What I expect to be happening is not. I am wondering if it is my fault or "transparent" just doesn't work. On page 25 of the Geomview manual, section 3.6.2 "The Materials Panel" it says "Geomview does not fully support transparency yet and on some machines (I'm on an Silicon Graphics Indigo 2) it does not work at all." This is why I'm not sure if I'm making a mistake or if "transparent" just doesn't work right. What I expect to happen is this: I have approximately 2500 triangles in my object. I have a huge .off file. In part of the .off file I have the 3 vertices for each triangle, the rgb value and an opacity value for the triangle. Like this: 3 2090 2091 2089 0.835294 0.929412 1.000000 1.000000 Farther down in the file, I have triangles with opacity 0.400000 Until I hit the "transparent" button on the Materials panel, everything should look the same (totally solid, same transparency) correct? Now, if I hit the transparent button, I should be able to "see through" the triangles with opacity 0.400000 and the traingles with opacity 1.0000 are still solid, correct? If I rotate the object, the 1.00000 opacity triangles should totally block out the 0.40000 opacity objects, right? Anyway, this is what I expect to happen and it's not. A couple other questions: Do the vertices in the triangle have to be listed in counterclockwise order for the transparency to work (some graphics libraries I have used require this)? Does the lighting effect transparency (how)? Any assistance you can provide is appreciated. -- William Anderst Dept. of Kinesiology Human Performance Lab Indiana Univerity
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