jReality - the forum

Thanks! I'm not sure I like the sampling idea too much, but since my geometries and scene graphs are very simple in the case I'm looking at, I might be able to write something up that intersects the geometry directly with the selected frustrum. What's a good way to compute the ray corresponding to t...

Many thanks! I was not drawing spheres or tubes. Setting both POINT_RADIUS and SPHERE_RADIUS to sufficiently small values solved the problem.

1) How can I change the sensitivity of picking? I've noticed that if I have two objects A and B with A in front of B, then sometimes A is picked even if the whole mouse pointer is clearly off A. What I'd like to do is tell the toolsystem to pick only objects within, say, 3 pixels of the current mous...

Thanks for the link.

So if I understand you correctly, the method I suggested has been tried, and didn't work?

I understand. The thing is, from the OpenGL documentation I found online I couldn't quite figure out whether dlDepthRange was applied before or after the perspective transformation. It seemed to make more sense to me to do it after, but that was just a guess. If you happened to have a link that expl...

Okay, problem identified. In the interactive example above, I had used a little script that populates the CLASSPATH and then calls the scala command, which is also a script. According to the documentation, it should accept -D arguments, but apparently it doesn't pass them to the JVM correctly. So I ...

Here's the transcript of an interactive session, with some slight editing to make it more readable. As you see somewhere in the middle, I didn't quite manage to get the jogl backend to work in this case, but I imagine that's only a matter of finding the right incantations. olaf@olaf-laptop:~/scratch...

Here's a quick translation of de.jreality.tutorial.too.DragEventTool01: package org.gavrog.scratch import java.awt.Color import scala.collection.mutable.ArrayBuffer import de.jreality.geometry.Primitives import de.jreality.scene.{Appearance, SceneGraphComponent} import de.jreality.scene.data.{Attrib...

I've used both Python and Ruby in larger projects, and they are pretty much in the same league. Personally, I prefer Python, but that's mostly a matter of taste. From memory, I found it a bit more difficult to interface with existing Java libraries from JRuby than from Jython. But that might have ch...

Hmm, if I understand correctly what glDepthRange does, wouldn't it be best to draw lines with glDepthRange(0.0d, 1.0d - OFFSET) and everything else with glDepthRange(OFFSET, 1.0d), where OFFSET is close to the depth buffer resolution?

Thank you so much! That helped a lot.

I suspected the DEPTH_FUDGE_FACTOR played a role, but didn't understand how to use it correctly.

Finding the best value does indeed seem tricky. If I come up with a good strategy, I'll let you know.

Hi! I'm trying to render relatively large polygonal meshes (~40k quadrangles) with both faces and edges shown. Tubes do of course display fine, but at that complexity start to hurt performance. When I set 'TUBES_DRAW' to false, I see lines disappear behind incident polygons at certain angles. I know...

I installed a MouseMotionListener on the viewing component that prints the mouse position on each drag. When the mouse pointer leaves the screen, drag events with position (0, 0) are generated. No idea why that would be a problem. Let me know if there's anything else I should try.

Okay, I poked the source code a bit more and found a better solution. The following modification to the end of RotateTool::perform() simply puts the rotation on hold until the mouse position leads to a correct transformation again: if (!fixOrigin) result.multiplyOnRight(center.getInverse()); if (Rn....

Thanks! That was quick. With your fix, the toolsystem still gets into a strange state, but it doesn't crash anymore. After experimenting a bit, I came up with the following modification to RotateTool::perform(), which makes the object jump a bit when the mouse pointer leaves the screen, but at least...