C++ (Cpp) vector::cross Examples

Programming Language: C++ (Cpp)

Class/Type: vector

Method/Function: cross

Examples at hotexamples.com: 4

The vector cross product is a mathematical operation that takes two vectors and returns a vector perpendicular to both. It is often used in physics and engineering to calculate torque and angular momentum.

Here are some code examples using the cross product operation in C++:

Example 1: Using the cross product to calculate torque

#include 
#include 

int main() {
    std::vector force = {2.0, 3.0, 4.0};
    std::vector lever_arm = {0.5, 0.0, 0.0};
    
    std::vector torque(3);
    torque[0] = force[1] * lever_arm[2] - force[2] * lever_arm[1];
    torque[1] = force[2] * lever_arm[0] - force[0] * lever_arm[2];
    torque[2] = force[0] * lever_arm[1] - force[1] * lever_arm[0];
    
    std::cout << "Torque: (" << torque[0] << ", " << torque[1] << ", " << torque[2] << ")" << std::endl;
    return 0;
}

Example 2: Using the cross product to calculate the normal to a plane

#include 
#include 

int main() {
    std::vector vec1 = {1.0, 2.0, 3.0};
    std::vector vec2 = {4.0, 5.0, 6.0};
    
    std::vector normal(3);
    normal[0] = vec1[1] * vec2[2] - vec1[2] * vec2[1];
    normal[1] = vec1[2] * vec2[0] - vec1[0] * vec2[2];
    normal[2] = vec1[0] * vec2[1] - vec1[1] * vec2[0];
    
    std::cout << "Normal: (" << normal[0] << ", " << normal[1] << ", " << normal[2] << ")" << std::endl;
    return 0;
}

The vector cross product operation is part of the C++ standard library and does not require any additional packages or libraries.

C++ (Cpp) vector::cross - 4 examples found. These are the top rated real world C++ (Cpp) examples of vector::cross from package poedit extracted from open source projects. You can rate examples to help us improve the quality of examples.

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PB(30)

GetSize(3)

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RemoveAll(1)

Normalize(1)

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GetVertex(1)

GetUV(1)

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Example #1

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File: quadtest.cpp Project: prepare/gameswf

void	MotionHandler(int x, int y)
// Handles mouse motion.
{
	float	dx = x - LastMouseX;
	float	dy = y - LastMouseY;
	LastMouseX = x;
	LastMouseY = y;
	
	if (LeftButton && RightButton) {
		// Translate in the view plane.
		vector	right = ViewerDir.cross(ViewerUp);
		ViewerLoc += right * dx / 3 * Speed + ViewerUp * -dy / 3 * Speed;
		
	} else if (LeftButton) {
		// Rotate the viewer.
		ViewerTheta += -dx / 100;
		while (ViewerTheta < 0) ViewerTheta += 2 * PI;
		while (ViewerTheta >= 2 * PI) ViewerTheta -= 2 * PI;

		ViewerPhi += -dy / 100;
		const float	plimit = PI / 2;
		if (ViewerPhi > plimit) ViewerPhi = plimit;
		if (ViewerPhi < -plimit) ViewerPhi = -plimit;

		ViewerDir = vector(1, 0, 0);
		ViewerUp = vector(0, 1, 0);
		
		ViewerDir = Geometry::Rotate(ViewerTheta, ViewerUp, ViewerDir);
		vector	right = ViewerDir.cross(ViewerUp);
		ViewerDir = Geometry::Rotate(ViewerPhi, right, ViewerDir);
		ViewerUp = Geometry::Rotate(ViewerPhi, right, ViewerUp);
		
	} else if (RightButton) {
		// Translate the viewer.
		vector	right = ViewerDir.cross(ViewerUp);
		ViewerLoc += right * dx / 3 * Speed + ViewerDir * -dy / 3 * Speed;
	}
}

Example #2

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File: vector.hpp Project: jaredhoberock/igloo

inline std::pair<vector,vector> basis(const vector& v1)
{
    // see PBRT v2 p63

    vector v2;

    if(std::fabs(v1.x) > std::fabs(v1.y))
    {
        float inv_length = 1.f / std::sqrt(v1.x*v1.x + v1.z*v1.z);

        v2 = vector(-v1.z * inv_length, 0, v1.x * inv_length);
    }
    else
    {
        float inv_length = 1.f / std::sqrt(v1.y*v1.y + v1.z*v1.z);

        v2 = vector(0, v1.z * inv_length, -v1.y * inv_length);
    }

    vector v3 = v1.cross(v2);

    return std::make_pair(v2,v3);
}

Example #3

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File: vector.hpp Project: Emma920/visual

inline vector
cross( const vector& v1, const vector& v2)
{ return v1.cross( v2); }

Example #4

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File: vector.hpp Project: CasualX/LibEx

inline vector<T,D> cross( const vector<T,D>& left, const vector<T,D>& right ) {
	return left.cross(right);
}