Created
June 21, 2017 13:13
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Java method (using Minecraft vectors) to detect a point in cone
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| /** | |
| * Checks if point is contained within a cone in 3D space | |
| * | |
| * @param start tip of the cone | |
| * @param normDirection normalized (length==1) vector, direction of cone | |
| * @param radius radius at the end of the cone | |
| * @param length length of the cone | |
| * @param truncationLength optional lenght at which the cone is truncated (flat tip) | |
| * @param relativePoint point to be checked, relative to {@code start} | |
| */ | |
| public static boolean isPointInCone(Vec3d start, Vec3d normDirection, double radius, double length, float truncationLength, Vec3d relativePoint) | |
| { | |
| double projectedDist = relativePoint.dotProduct(normDirection); //Orthogonal projection, establishing point's distance on cone direction vector | |
| if(projectedDist<truncationLength || projectedDist>length) //If projected distance is before truncation or beyond length, point not contained | |
| return false; | |
| double radiusAtDist = projectedDist/length * radius; //Radius of the cone at the projected distance | |
| Vec3d orthVec = relativePoint.subtract(normDirection.scale(projectedDist)); //Orthogonal vector between point and cone direction | |
| return orthVec.lengthSquared()<(radiusAtDist*radiusAtDist); //Check if Vector's length is shorter than radius -> point in cone | |
| } |
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