plane

问题 In three.js, the constructor for the Math Plane takes 2 inputs: normal -- (Vector3) normal vector defining the plane pointing towards the origin constant -- (Float) the negative distance from the origin to the plane along the normal vector Can someone provide an illustration or explain how this works? I can understand given a point and normal how to construct a plane, or 3 co-planar points, but can't figure out how a normal vector and constant can be used. 回答1: TL:DR? Mathy-ness and linear

问题 I want to render a plane so that it looks as if it goes to infinity in all directions. I want the plane boundary in the distance to be the horizon. Using a simple mesh does not work - the computer can't render infinitely many triangles. Even if this was possible, the camera frustum would cut out the distant polygons and create a gap between the plane boundary and the horizon. A workaround is to compute the horizon mathematically: finding points on the plane, which also lie on the plane at

问题 I have a 3d point, defined by [x0, y0, z0] . This point belongs to a plane, defined by [a, b, c, d] . normal = [a, b, c] , and ax + by + cz + d = 0 How can convert or map the 3d point to a pair of (u,v) coordinates ? This must be something really simple, but I can't figure it out. 回答1: First of all, you need to compute your u and v vectors. u and v shall be orthogonal to the normal of your plane, and orthogonal to each other. There is no unique way to define them, but a convenient and fast

问题 I am given a set of point in the x-y plane ={(x1,y1),(x2,y2),.....(xn,yn)} and I am given two points a(xa,ya) and b(xb,yb) and asked to find the set of points that cover the shortest path. no connection between points are given. If I assume a connection to every other point.it will take a long time to compute these values for a weighted graph. Can someone tell me what reading I should do. what topic does this problem come under graph algorithms?!!(Is there any specific algorithm) I have been

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . OK, here's what I have so far: Assumptions: You have at least 3 coplanar line segments Sort the list by x-coordinate of start point or something Step through the list and see if the start point of line2 is at the end point of line 1 and so on If the end point of the last one is on

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Essentially, i want to find the equation of the ring that circles a point in space, this ring is perpendicular to a normal away from this point. I have a line, in the form of 2 points, L1 , L2 ; I have the normal from L1->L2, N ; I have the plane that is normal to L1->L2, which L1 lies on. ax + by + cz = d ; I

问题 I've recently been working on a project in wich I'd have to detect walls, floor and ceiling in a 3D mesh. After doing some research I've been able to detect the floor and some part of the walls using RANSAC algorithms. I was just wondering if anybody could be able to explain the difference between plane-fitting and plane segmentation as they both seem to result into a point cloud containing the floor? 回答1: Plane fitting is generally understood as a pure least-squares based fitting technique

问题 x <-rnorm(500,50,2) y <-rnorm(500,5,1) z <-rnorm(500,6,1) s3d <- scatterplot3d(x[z<6], y[z<6], z[z<6], zlim=range(z), color="darkgrey", col.axis="blue",col.grid="lightblue", main="scatterplot3d - 1", pch=20) s3d$plane3d(6,0,0) s3d$points3d(x[z>=6], y[z>=6], z[z>=6], pch=20) The above code tells me how to add a plane 'z=6' to the 3d scatter plot. The first question is: I'm wondering how to add a plane such as 'x=3' or 'y=2'. R help file explains that plane3d(Intercept, x.coef = NULL, y.coef =

问题 I am trying to make a function that will invert a Three.js Geometry across the xz plane. Scaling the geometry by (1, -1, 1) will effectively do just this, but now the planes that were facing outwards are facing inwards, so I can see through the geometry. I know there is a way to render both sides of the faces, but I'd rather not so I can speed up render times. Is there an easy way I can toggle which face of a plane is shown? 回答1: material.side = THREE.BackSide or material.side = THREE

问题 I am reading Network Layer in 'Computer Networking: A top-down approach'. It says, Data plane operates at the nanosecond time scale and is implemented in hardware. Whereas router's control functions operate at the millisecond or second timescale. These control plane functions are implemented in software and execute on the routing processor (typically a traditional CPU). Now my question is about routing processor. Is routing processor (or traditional CPU) a hardware or software? 回答1: Routers