我无法找到有关 find4QuadCornerSubpix() 函数的任何类型的信息。我试图了解 find4QuadCornerSubpix() 和 cornerSubPix() 之间的区别。
有人可以帮助我吗?
谢谢
我需要创建一个这样的网格:
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并仅用线条渲染它。这就是我创建顶点和索引的方式:
std::vector<glm::vec3> vertices;
std::vector<glm::uvec3> indices;
for(int j=0; j<=slices; ++j) {
for(int i=0; i<=slices; ++i) {
float x = (float)i/(float)slices;
float y = 0;
float z = (float)j/(float)slices;
vertices.push_back(glm::vec3(x, y, z));
}
}
for(int j=0; j<slices; ++j) {
for(int i=0; i<slices; ++i) {
int row1 = j * (slices+1);
int row2 = (j+1) * (slices+1);
indices.push_back(glm::uvec3(row1+i, row1+i+1, row2+i+1)); …Run Code Online (Sandbox Code Playgroud) 我尝试在结构中初始化一个数组,如下所示:
struct myStruct {
vec3 data[20] = vec3[20] (vec3(1, 1, 1), vec3( 1, -1, 1), vec3(-1, -1, 1), vec3(-1, 1, 1),
vec3(1, 1, -1), vec3( 1, -1, -1), vec3(-1, -1, -1), vec3(-1, 1, -1),
vec3(1, 1, 0), vec3( 1, -1, 0), vec3(-1, -1, 0), vec3(-1, 1, 0),
vec3(1, 0, 1), vec3(-1, 0, 1), vec3( 1, 0, -1), vec3(-1, 0, -1),
vec3(0, 1, 1), vec3( 0, -1, 1), vec3( 0, -1, -1), vec3( 0, 1, -1));
};
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但我收到此错误:
ERROR: 0:84: '=' …Run Code Online (Sandbox Code Playgroud) 我编写了以下代码来创建一个带有构造函数的类,该构造函数将变量数(N)的整数加上两个double作为参数,如下所示:
#include <cstdio>
#include <cstdlib>
#include <vector>
#include <array>
template <std::size_t N>
class point_t {
public:
std::vector<int> values;
template<typename ... Args>
point_t(Args ... args, double distance, double value) {
std::array<int , N> list = {(args)...};
for(std::size_t i=0; i<N; ++i) values[i] = list[i];
}
};
int main(int argc, char *argv[]) {
point_t<4> test(1, 2, 3, 4, 3.0, 6.7);
return 0;
}
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编译器返回以下错误:
没有用于初始化'point_t <4>'的匹配构造函数
候选构造函数不可行:需要2个参数,但是提供了6个参数
我错过了什么?
我在获取 LP 问题的解决方案时遇到问题。
这是调用 cplex.solve() 后 CPLEX 的输出;
CPXPARAM_MIP_Strategy_CallbackReducedLP 0
Found incumbent of value 0.000000 after 0.00 sec. (0.70 ticks)
Tried aggregator 1 time.
MIP Presolve eliminated 570 rows and 3 columns.
MIP Presolve modified 88 coefficients.
Reduced MIP has 390 rows, 29291 columns, and 76482 nonzeros.
Reduced MIP has 29291 binaries, 0 generals, 0 SOSs, and 0 indicators.
Presolve time = 0.06 sec. (49.60 ticks)
Tried aggregator 1 time.
Reduced MIP has 390 rows, 29291 columns, and 76482 nonzeros. …Run Code Online (Sandbox Code Playgroud)