Yeah, I stumbled upon this topic too (NURBS). It’s pretty nice for 3D development I think.
There are different types of CatMulRom-Splines. Look at this article:
There is also a graphic which compares the Uniformed one with a Centripedal CatMulRom and a Chordal CatMulRom.
I think espacially the Centripedal one could be used for creating surfaces. At least it looks so for me.
Wikipedia says:
“it will not form loop or self-intersection within a curve segment. Second, cusp will never occur within a curve segment. Third, it follows the control points more tightly”
But i’m just guessing here
BTW: I think about integrating a possibility of adding a (textured) polygon-stripe to a spline curve, which would make it possible to bend images around such a spline (roads, railroads, laser beams etc).
Ya the thing about curves and surface splines is there are really two important issues minus big words.
Mind you im terrible at math never even took algebra. But here goes.
The continuity of the curve geometry.
Basically you want (C2 curvature) but you want some sort of ability to turn that down to at certain points for sharp edges.
In relation to uv texturing.
You want the acceleration of the curve to be non uniform so that you can control er prevent or allow stretching of a texture across the surface. This is related to the acceleration of the generated points on a curve or surface. Sometimes called G3 or G4 continuous.
This second part is the really important part the continuity is far less important (provided you have at least some control) then the ability to change uv acceleration.
Yeah, having geometric continuity per mouse click or keystroke would be nice. At least you can achieve that by “playing around with the control points”. But doing this always manually can make you angry sometimes.
For the MonoGame.SplineFlower library I plan to add at least parametric continuity (BézierSplines & CatMulRomSplines), so that particles or a spline walker can have the same velocity or acceleration over time.
Regarding CatMulRom-Splines there are also other tricks like adding or removing tension to a curve to make it sharper or softer. In combination with an alpha value 0-1f you could have a pretty nice control over your generated curves (0 = uniform, 0.5 = centripedal, 1 = chordal [inclusive all the grey-zones]).
But I don’t know if this would be good enough for 3D-Development.
I’ll continue my inquiry here instead ^_^y sorry tweetter has little text to offer : - D
Here it goes bro,
I have a function that returns a Points from a given line Start-Position and End-Position with a given Contour in the middle, can I extract the points position and it’s cotour from the editor ?
E;g:
Start, Counter, End
1, 1.5, 2
2, 2.5, 3
3, 3.5, 4
This my function looks like
/// <summary>
/// Curve to points.
/// </summary>
/// <param name="pStart">Line start point</param>
/// <param name="pEnd">Line end point</param>
// <param name="pContour">Curve center contour</param>
/// <param name="pSegment">Desired number of segment</param>
/// <returns></returns>
public static Vector3[] CreateCurvePointsFromLine( Vector3 pStart, Vector3 pEnd, Vector3 pContour, int pSegment )
{
return CreateCurvePointsFromLine(ref pStart, ref pEnd, ref pContour, pSegment );
}
mFrom = 1;
mContour = 1.5;
mTo = 2;
var Vector3[] CreateCurvePointsFromLine( mFrom, mContour, mEnd, 4 );
This will give 4 points as shown below
To make the long story short bro, can I extract the lines position with a contour?
Do you want to convert the points from your function to a spline and make this spline visible in the editor?
I just need the points to follow, can I export the points from your editor and save it in a text file all the points of the car to follow as on your example:
Have you tried to restore the nuget packages?
I download it directly your from your github, I’ll try nuget instead ^_^y
EDIT: Works the restore nuget and dependencies are ok,
One more problem which I always encountered on using MVSC 2017, i’'ll try to compile it on MVSC 2015 and plays with it… Thanks ^_^Y
Click on “File->Export JSON” in the editor and chose a save location. You can open the json file with any text editor. If you need help loading this data back to your environment then don’t hesitate to ask. I will help you bro
This is a picture from the internet. The right option is not selected here. It’s the one below the red marker “Restore NuGet Packages”.
Click on that and see if it resolves your issue with missing DLLs.
Edit: Ah, I see it helped. The two error messages on the top are just post build events. You don’t need them on your side. You can delete them in the project “Properties->Build Events” section.
By clicking and dragging the orange transform it’s possible to do this now:
Renamed ShowBezierSpline to ShowSpline.
Added ShowCenterTransform to make it possible to hide or show the transform in the center of the spline.
Only calculating the CenterTransform when necessary.
It’s now possible to programmatically create a spline by using the new constructor.
Added CenterTransformMode “None”. On this mode the whole spline can be moved by dragging the CenterSpline with the left mouse button.
Fixed that points which could be placed exactly at the start point (index 0) could resulting in wrong calculations.
After importing a spline the newly imported spline will be placed on the center of the screen.
Added NuGetRelease configuration so that if building in Release configuration, it wouldn’t result in compilation errors on the users end, because of the post build commands. @DexterZ
It’s now possible to change the CenterTransformMode (Rotate, Scale, ScaleRotate) in the Sample- and Editor project.
Fixed IndexOutOfRangeException when the CurrentTriggerIndex was -1 in the SplineWalker class.
Added additional NullReference checks for the splineControl and the splineControl.MySplineWalker. @DexterZ
It’s now possible to scale the whole spline by dragging the CenterSpline transform with the left mouse button.
It’s now possible to rotate and scale-rotate the whole spline.
Added public bool IsCenterSpline to check if a Transform is the center of the spline or not.
Renamed GetSplineCenter to CenterSpline.
Added checks to determine if a Transform is a point on a spline or the CenterTransform.
Removed LineControl sample and CurveControl sample from the project.
Extended GameSample to demonstrate new features.
The orange transform will always be in the center of the spline:
This update should improve MonoGame.SplineFlower by alot.
That’s exactly what I’m doing on the json file output, points can be switch to Z or Y axis in 3D, I’m using it for the AI paths of my enemies ships in 3D, same paths but when rotated and scaled it becomes seemless and not a pattern, a must have tools ^_^y
Yes but the ships AI paths is hard coded it’s just no. 8 paths rotated by matrix just (1)one paths T_T … But now I can create many paths visually by your using tools! YAY!
EDIT : BTW the latest release compiled and run successfully! many thanks ^_^Y
Hey sqrMin1. Apologies for the bump. This exactly what I need, great tool you made. However I am having a problem using the content pipeline importer. I’ve installed from nuget, and added MonoGame.SplineFlower.Content.Pipeline.dll as a reference in the content manager, but I don’t see the option to select the importer and processor after doing this. I’m on VS2017. Is there a step I missed here?
