I'm new in sprite kit. I'm taking the value at a specific position of a matrix, but I really have a problem when I print that value. The simulator prints: optional(nil value) instead of printing just the value.
So, how can I get the reValue in a specific position of the matrix?
Code:
NumColumns = 4
NumRows = 4
func matrix() {
var valor = "0"
var principal = "0"
for var column = 0; column < NumColumns; column++ {
for var j = 0; j < NumRows; j++ {
valor = "\(numbers[column, j])"
cont++
principal = "\(cont)"
if valor != "0" {
numbers[column, j] = valor + principal
println("\(numbers[column, j])") //This print show: optional(nil >value)
}
else {
numbers[column, j] = principal
}
}
}
}
You can create a two-dimensional matrix of strings with the following:
var numColumns = 4
var numRows = 4
// Create a 4x4 matrix of Strings
var array = [[String]](count: numColumns, repeatedValue:[String](count: numRows, repeatedValue:String()))
// Assign a string to a matrix element
array[1][2] = "element at (1,2)"
println (array[1][2])
Related
I have a nested list, like List<List> matrix ( this matrix contains values like [ {"X","","O"}, {"","X",""}, {"","","O"}])
Need to Pick only those indexes from this nested list which is empty, like empty matrix =[(0,1), (1,0),(1,2),(2,0),(2,1)] in a list. After that I want to return only one value from the empty matrix , like new value = (1,0);
my code is here
List<String> checkEmptyFields() {
final playervalue = matrix;
final n = countMatrix;
var element;
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
if (!(playervalue[i][j].contains("X") ||
playervalue[i][j].contains("O"))) {
storeEmptyFields= jsonDecode(playervalue[i][j]);
}
}
element = storeEmptyFields.values.toList(); // need to pick only one value and
return like (0,2)
return element;
}
return element;
}
I want to load in my matlab geometry into my three.js scene. My 3D data is saved in a struct .mat file which contains .vertices, .faces, .VertexNormals and .VertexColorData arrays. I am able to load it into JavaScript and use buffer geometry and set attributes to store the data into a mesh geometry.
var keyName = keysArray[0];
meshGeometry = new THREE.BufferGeometry();
var index = 0;
var positions = new Float32Array(bfjson.data[keyName].vertices.length * 3);
for (let i = 0; i < bfjson.data[keyName].vertices.length; i++) {
positions[index++] = bfjson.data[keyName].vertices[i][0];
positions[index++] = bfjson.data[keyName].vertices[i][1];
positions[index++] = bfjson.data[keyName].vertices[i][2];
}
meshGeometry.setAttribute(
'position',
new THREE.BufferAttribute(positions, 3));
var index = 0;
var vectornormals = new Float32Array(bfjson.data[keyName].VertexNormals.length * 3);
for (let i = 0; i < bfjson.data[keyName].VertexNormals.length; i++) {
vectornormals[index++] = bfjson.data[keyName].VertexNormals[i][0];
vectornormals[index++] = bfjson.data[keyName].VertexNormals[i][1];
vectornormals[index++] = bfjson.data[keyName].VertexNormals[i][2];
}
meshGeometry.setAttribute(
'normal',
new THREE.BufferAttribute(vectornormals, 3));
var index = 0;
//var faces = new Uint16Array(bfjson.data[keyName].faces.length * 3);
var faces = [];
for (let i = 0; i < bfjson.data[keyName].faces.length; i++) {
faces[index++] = bfjson.data[keyName].faces[i][0];
faces[index++] = bfjson.data[keyName].faces[i][1];
faces[index++] = bfjson.data[keyName].faces[i][2];
}
meshGeometry.setIndex(faces);
// default color attribute
const colors = [];
for (let i = 0, n = meshGeometry.attributes.position.count; i < n; ++i) {
colors.push(1, 1, 1);
}
meshGeometry.setAttribute('color', new THREE.Float32BufferAttribute(colors, 3));
for (let i = 0; i < bfjson.data[keyName].CData.length; i++) {
CData[i] = (bfjson.data[keyName].CData[i]);
}
meshGeometry.setAttribute('perfusion', new THREE.Float32BufferAttribute(CData, 1));
mesh.geometry = meshGeometry;
updateColors();
The vertex coloring works fine. However, I end up with mesh with index faces or normal not connecting into a normal surface.
mesh with index faces or normal not connecting up into a normal surface.
I am not sure what I am doing wrong. I will be extremely grateful for any help provided.
Edit--
I have made a jsfiddle to help.
https://jsfiddle.net/marieO/5zdhsk78/68/
But you need to download the .mat file first then upload it to the scene. (as I was unable to add it to the jsfiddle)
https://dev.kingsvirtualanatomyandhistology.kcl.ac.uk//models/mat/p21_newmod.mat
Thanks for posting a working example with the steps needed to reproduce the error. It makes it much easier to help.
You have 652 vertices in your Matlab geometry. When using .setIndex(), these indices have to be in the [0, 651] range, because JavaScript arrays start at index 0. However, your faces data ranges from [1, 652], which means all your triangles are off by 1 vertex.
This is easily solvable by adding a -1 when assigning the index:
var index = 0;
var faces = [];
for (let i = 1; i < bfjson.data[keyName].faces.length; i++) {
faces[index++] = bfjson.data[keyName].faces[i][0] - 1;
faces[index++] = bfjson.data[keyName].faces[i][1] - 1;
faces[index++] = bfjson.data[keyName].faces[i][2] - 1;
}
meshGeometry.setIndex(faces);
Result:
I need to generate such a field:
Photo
But I don't know how to do it. What happened to me:
My result
My code:
[ContextMenu("Generate grid")]
public void GenerateGrid()
{
for(int x = 0; x < _gridSize.x; x++)
{
for (int z = 0; z < _gridSize.z; z++)
{
var meshSize = _cell.GetComponent<MeshRenderer>().bounds.size;
var position = new Vector3(x * (meshSize.x + _offset), 0, z * (meshSize.z + _offset));
var cell = Instantiate(_cell, position, Quaternion.Euler(_rotationOffset), _parent.transform);
cell.GridActions = GridActions;
cell.Position = new Vector2(x, z);
cell.name = $"Cell: x:{x}, z:{z}";
GridActions.AllCell.Add(cell);
}
}
}
Simply for every odd z value, move the cell up/down by half a cell size, and move them inward toward the previous cell half a cell size. I didnt test it, but here is the code that might do that, not sure tho, again I didnt test this.
[ContextMenu("Generate grid")]
public void GenerateGrid()
{
for(int x = 0; x < _gridSize.x; x++)
{
for (int z = 0; z < _gridSize.z; z++)
{
int xResize = 0;
int zResize = 0;
if (z % 2 == 1) {
xResize = meshSize.x / 2;
zResize = meshSize.z / 2;
}
var meshSize = _cell.GetComponent<MeshRenderer>().bounds.size;
var position = new Vector3(x * (meshSize.x + _offset - xResize), 0, z * (meshSize.z + _offset - zResize));
var cell = Instantiate(_cell, position, Quaternion.Euler(_rotationOffset), _parent.transform);
cell.GridActions = GridActions;
cell.Position = new Vector2(x, z);
cell.name = $"Cell: x:{x}, z:{z}";
GridActions.AllCell.Add(cell);
}
}
}
This is how I defined the functions and the variable x,y,z is defined with some integer.
var a = 0;
var x = 1;
var y = 2;
var z = 3;
function f(n) {
a = n;
}
function g(){
console.log(a);
}
function h(){
f(x); g();
}
function k() {
var a = 0; g(); f(y);
}
f(z); g(); k(); g(); h(); g();
The following is my thoughts on if the code above is dynamically scope:
f(z){
a = z; // The value of a became z
}
g(){
console.log(a); // Printing out the value of z
}
k(){
var a = 0;
g(){
console.log(a); // Printing out 0
}
f(y){
a = y; // Assign the value of y to the variable a initialized 5 lines above
}
}
g(){
console.log(a); // Printing out the value of z
}
h(){
f(x){
a = x;
}
g(){
console.log(a) // Printing out the value of x
}
}
g(){
console.log(a) // Printing out value of z or x ??
}
Not sure what the last console.log will output.
See the example snippet with it's comments:
var a = 0;
var z = 1;
var x = 2;
var y = 4;
function f(n) {
a = n;
}
function g(){
console.log(`value of var a is ${a}`); // output var a value to console
}
function h(){
f(x); // a becomes 2 here since x = 2
g(); // output var a value to console
}
function k() {
var a = 0; // this sets a to 0 only in function scope
console.log(`function scope value of var a is ${a}`);
g(); // output var a value to console which is 1 here not 0
f(y); // a becomes 4 here since y = 4
}
f(z);
g();
k();
g();
h();
g();
console.log(`final value of var a is ${a}`);
The below example works as you want (if i understood your question). Simply omit var before a in function k().
var a = 0;
var z = 1;
var x = 2;
var y = 4;
function f(n) {
a = n;
}
function g(){
console.log(`value of var a is ${a}`); // output var a value to console
}
function h(){
f(x); // a becomes 2 here since x = 2
g(); // output var a value to console
}
function k() {
a = 0; // this sets a to 0 only in function scope
console.log(`function scope value of var a is ${a}`);
g(); // output var a value to console which is 1 here not 0
f(y); // a becomes 4 here since y = 4
}
f(z);
g();
k();
g();
h();
g();
console.log(`final value of var a is ${a}`);
I am trying to merge two sets of points from two different views to one single point cloud and visualize it with PCL cloud viewer.
mPtrPointCloud->points.clear();
mPtrPointCloud->points.resize(mFrameSize * 2);
auto it = mPtrPointCloud->points.begin();
received = PopReceived();
if(received != nullptr)
{
// p_data_cloud = (float*)received->mTransformedPC.data;
p_data_cloud = (float*)received->mCVPointCloud.data;
index = 0;
for (size_t i = 0; i < mFrameSize; ++i)
{
float X = p_data_cloud[index];
if (!isValidMeasure(X)) // Checking if it's a valid point
{
it->x = it->y = it->z = it->rgb = 0;
}
else
{
it->x = X;
it->y = p_data_cloud[index + 1];
it->z = p_data_cloud[index + 2];
it->rgb = convertColor(p_data_cloud[index + 3]); // Convert a 32bits float into a pcl .rgb format
}
index += 4;
++it;
}
}
frame = PopFrame();
if(frame != nullptr)
{
// p_data_cloud = frame->mSLPointCloud.getPtr<float>();
p_data_cloud = (float*)frame->mCVPointCloud.data;
index = 0;
for (size_t i = 0; i < mFrameSize; ++i)
{
float X = p_data_cloud[index];
if (!isValidMeasure(X)) // Checking if it's a valid point
{
it->x = it->y = it->z = it->rgb = 0;
}
else
{
it->x = X;
it->y = p_data_cloud[index + 1];
it->z = p_data_cloud[index + 2];
it->rgb = convertColor(p_data_cloud[index + 3]); // Convert a 32bits float into a pcl .rgb format
}
index += 4;
++it;
}
}
mPtrPCViewer->showCloud(mPtrPointCloud);
What I want to have is two sets of points are "fused" to one frame. However, it seems these two sets of points are still shown separately one after the other.
Could anyone help to explain how to really merge two sets of points into one cloud? Thanks
(1) Create a new empty pointcloud which will be the merged pointcloud at the end
pcl::PointCloud<pcl::PointXYZ> mPtrPointCloud;
(2) Transform point clouds to origin
pcl::PointCloud<pcl::PointXYZ> recieved_transformed;
Eigen::Transform<Scalar, 3, Eigen::Affine> recieved_transformation_mat(recieved.sensor_origin_ * recieved.sensor_orientation_);
pcl::transformPointCloud(recieved, recieved_transformed, recieved_transformation_mat);
pcl::PointCloud<pcl::PointXYZ> frame_transformed;
Eigen::Transform<Scalar, 3, Eigen::Affine> frame_transformation_mat(frame.sensor_origin_ * frame.sensor_orientation_);
pcl::transformPointCloud(frame, frame_transformed, frame_transformation_mat);
(3) Use the += operator
mPtrPointCloud += received_transformed;
mPtrPointCloud += frame_transformed;
(4) Visualize merged pointcloud
mPtrPCViewer->showCloud(mPtrPointCloud);
That's it. See also example http://pointclouds.org/documentation/tutorials/concatenate_clouds.php
http://pointclouds.org/documentation/tutorials/matrix_transform.php