3D curve and control points

Hello All-
I'm sure this is an easy answer; just can't seem to figure it out. I've drawn out a curve with a few control points. All I want to do is adjust the control point so the curve is 3D. Each point should have an X,Y and Z value. But when I switch to 3D the points only retain the X and Y. I am not able to move the points in any view other than the one I drew the path in.
What's up with that? Am I missing something or ...
And why can't I see the curve in the viewport unless I have Adjust Control Points or Adjust Item Tool active. Shouldn't a curve (shape) inside a group be visible at all times?
What I want to is create curves that will go around an object and I can attach a brushstroke to the curve. Can I do that some how?

Curves drawn with the shape tools, as you have discovered, are 2-D: the control points only have X and Y coordinates. They can live in 3D space, but they live on a plane.
One fix is to instead use a motion path behavior - its control points can be manipulated in x, y, and z.
There is another fix using a replicator and a frozen sequence replicator behavior, but it all depends on what you are trying to do.

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Attachments:
Low Pressure.JPG ‏267 KB
High Pressure.JPG ‏398 KB
Mid Pressure.JPG ‏266 KB

Kyle,
First off....I appreciate your comments. No...there is no value is system represented as U16.
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I was curious about something....the set point value I'm inputting into the PID.VI , shown in the high pressure.jpg file, is from EGU to percent.VI. It would look exactly like the EGU to percent VI feeding the process variable input of the PID.VI with the set point value feeding the EGU to percent.VI input. Would I be better off feeding the actual set point value to the PID.VI input instead of percentage?
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FrankMtl wrote:
Any key click available to ensure I select the control point I want to move and not create a new one?
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Go to Solution.

What you basically want is a loop with an event structure where you process Mouse Down, Move and Up events for your controls. There are any number of ways of implementing something like this, but this one will probably be the simplest:
Use a multicolumn listbox or a table for your grid. Hide the scrollbars and headers.
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White and black point vs ??

I never know which forum to post these things, so I'll start with the photographers.
 
 These three shots are as follows: (1) the camera raw version, (2) where I moved the sliders from the ends to approximately the beginning/end of the major portion of the histogram, and (3) using the threshold control to find the white and black points in the main part of the picture.
 
 Then, in the two adjusted versions, I lightened the image with the curves control.
 
 In both these cases, I used the grey dropper to touch the same spot on one of the rocks, to get the apparent neutral point.
 
 It seems to me that the threshold method to find the white and black points is preferred, based on the overall color and appearance of the finished adjustment.
 
 But, I've found on some images where the histogram has missing black and missing white, if I adjust the sliders to these two ends, I get pretty much the same outcome, as far as the contrast, color, and grey point.
 
 Could I have some advice on the preferred method to use in handling my image adjustments? Doing it the threshold method takes more time, and sometimes it's difficult to find the white and black points, or even the grey point.
 
 Thanks.
 
 Al
 
 
<a href="http://www.pixentral.com/show.php?picture=1SlEeG9kfwzD34gVOEcCbg7Ktp83p3" /></a>
<img alt="Picture hosted by Pixentral" src="http://www.pixentral.com/hosted/1SlEeG9kfwzD34gVOEcCbg7Ktp83p3_thumb.jpg" border="0" />
 
 
<a href="http://www.pixentral.com/show.php?picture=1tIEs4eAyKz4sxamyVaYRlKjTIIfKj" /></a>
<img alt="Picture hosted by Pixentral" src="http://www.pixentral.com/hosted/1tIEs4eAyKz4sxamyVaYRlKjTIIfKj_thumb.jpg" border="0" />
 
 
<a href="http://www.pixentral.com/show.php?picture=17K3ewFXsGo4K2uH5TGfO06CdVayyn1" /></a>
<img alt="Picture hosted by Pixentral" src="http://www.pixentral.com/hosted/17K3ewFXsGo4K2uH5TGfO06CdVayyn1_thumb.jpg" border="0" />

Yes the image was purposely underexposed. What I was trying to accomplish was to speed up the shutter speed to remove the slight blurring and compensate by pulling data from the shadows. Even though the lens has an image stabilizer the amount of light wasn't enough for a proper sharp shot.
this image is before touch up
These two images are F/5.6, 1/20, ISO 800
After touch up
Better lit scene but shows slight motion blur
This last image is F/5.6, 1/4, ISO 800
I believe that I will have to wait next year and hope I have a faster lens by then. I just don't think the 28mm-135mm f/3.5-5.6 lens is fast enough. I was trying this without a tripod to get in tighter.
Also I was taking these shots without the flash to get the drama of the tree lights.
What I would have prefer is a shutter speed of 1/125 or better as it helps with my hands shaking I believe the slowest should be 1/60
And the lower the ISO the better for noise.
These preferences are what I am used to with my Canon G3 that does not have IS.
I am getting so off track here, lol. But anyways, here are the pictures.

Using more than 2 control points in Interpolater.Spline

Hello,
what I'm working on is a bouncing ball, I figured it might work controlling the interpolator to create a multiple control points using the spline. ( a function with x ^n^ , where n is the number of control points)
In a spline I can use only two control points, is there a way to make it use more than that, or do i have to use another way.
Thanks for all help.
Edited by: A.m.z on May 9, 2013 1:49 AM
Edited by: A.m.z on May 9, 2013 1:49 AM

Well, I guess it wasn't so hard - at least when there are libraries written by others to borrow from . . .
This interpolator requires the apache commons math 3.2 lib - you can download commons-math3-3.2-bin.zip from here:
http://commons.apache.org/proper/commons-math/download_math.cgi
Extract commons-math3-3.2.jar from the zip and put it on your class path.
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Instead of control points which bend the curve but do not lie on the curve, the interpolator takes a set of points and plots a curve of best fit directly through the points.
import javafx.animation.Interpolator;
import org.apache.commons.math3.analysis.interpolation.SplineInterpolator;
import org.apache.commons.math3.analysis.polynomials.PolynomialSplineFunction;
public class BestFitSplineInterpolator extends Interpolator {
final PolynomialSplineFunction f;
BestFitSplineInterpolator(double[] x, double[] y) {
 f = new SplineInterpolator().interpolate(x, y);
@Override protected double curve(double t) {
 return f.value(t);
}Here is an example usage:
import javafx.animation.*;
import javafx.application.Application;
import javafx.scene.* ;
import javafx.scene.paint.*;
import javafx.scene.shape.*;
import javafx.stage.Stage;
import javafx.util.Duration;
public class BestFitSplineDemo extends Application {
private static final Duration CYCLE_TIME = Duration.seconds(7);
private static final int PLOT_SIZE = 500;
private static final int N_SEGS = PLOT_SIZE / 10;
public void start(Stage stage) {
 Path path = new Path();
 path.setStroke(Color.DARKGREEN);
 final Interpolator pathInterpolator = new BestFitSplineInterpolator(
 new double[] { 0.0, 0.25, 0.5, 0.75, 1.0 },
 new double[] { 0.0, 0.5, 0.3, 0.8, 0.0 }
 // interpolated spline function plot.
 plotSpline(path, pathInterpolator, true);
 // animated dot moving along the plot according to a distance over time function.
 final Interpolator timeVsDistanceInterpolator = new BestFitSplineInterpolator(
 new double[] { 0.0, 0.25, 0.5, 0.75, 1.0 },
 new double[] { 0.0, 0.1, 0.4, 0.85, 1.0 }
 Circle dot = new Circle(5, Color.GREENYELLOW);
 PathTransition transition = new PathTransition(CYCLE_TIME, path, dot);
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 transition.play();
 // show a light grey path representing the distance over time.
 Path timeVsDistancePath = new Path();
 timeVsDistancePath.setStroke(Color.DIMGRAY.darker());
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 plotSpline(timeVsDistancePath, timeVsDistanceInterpolator, true);
 stage.setScene(
 new Scene(
 new Group(
 timeVsDistancePath,
 path,
 dot
 Color.rgb(35,39,50)
 stage.show();
// plots an interpolated curve in segments along a path
// if invert is true then y=0 will be in the bottom left, otherwise it is in the top right
private void plotSpline(Path path, Interpolator pathInterpolator, boolean invert) {
 final double y0 = pathInterpolator.interpolate(0, PLOT_SIZE, 0);
 path.getElements().addAll(
 new MoveTo(0, invert ? PLOT_SIZE - y0 : y0)
 for (int i = 0; i < N_SEGS; i++) {
 final double frac = (i + 1.0) / N_SEGS;
 final double x = frac * PLOT_SIZE;
 final double y = pathInterpolator.interpolate(0, PLOT_SIZE, frac);
 path.getElements().add(new LineTo(x, invert ? PLOT_SIZE - y : y));
public static void main(String[] args) { launch(args); }
}Edited by: jsmith on May 11, 2013 5:58 AM

3D curve and control points

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