- Qt 5.15
- Qt Quick
- QML Types
- vector3d QML Basic Type
- Qt 5.15.18 Reference Documentation

# vector3d QML Basic Type

The `vector3d` type refers to a value with `x`, `y`, and `z` attributes.

To create a `vector3d` value, specify it as a "x,y,z" string:

     Rotation { angle: 60; axis: "0,1,0" }

or with the Qt.vector3d() function:

     Rotation { angle: 60; axis: Qt.vector3d(0, 1, 0) }

or as separate `x`, `y`, and `z` components:

     Rotation { angle: 60; axis.x: 0; axis.y: 1; axis.z: 0 }

Each attribute of a vector3d value is stored internally as a single-precision floating point number (`float`).

When integrating with C++, note that any QVector3D value passed into QML from C++ is automatically converted into a `vector3d` value, and vice-versa.

The vector3d type has the following idempotent functions which can be invoked in QML:

Function Signature | Description | Example
--- | --- | ---

vector3d crossProduct(vector3d other)

Returns the vector3d result of the cross product of `this` vector3d with the `other` vector3d

     var a = Qt.vector3d(1,2,3);
     var b = Qt.vector3d(4,5,6);
     var c = a.crossProduct(b);
     console.log(c.toString()); // QVector3D(-3, 6, -3)

real dotProduct(vector3d other)

Returns the scalar real result of the dot product of `this` vector3d with the `other` vector3d

     var a = Qt.vector3d(1,2,3);
     var b = Qt.vector3d(4,5,6);
     var c = a.dotProduct(b);
     console.log(c); // 32

vector3d times(matrix4x4 matrix)

Returns the vector3d result of transforming `this` vector3d with the 4x4 `matrix` with the matrix applied post-vector

     var a = Qt.vector3d(1,2,3);
     var b = Qt.matrix4x4(4,5,6,7,8,9,10,11,
                          12,13,14,15,16,17,18,19);
     var c = a.times(b);
     console.log(c.toString());
     // QVector3D(0.774194, 0.849462, 0.924731)

vector3d times(vector3d other)

Returns the vector3d result of multiplying `this` vector3d with the `other` vector3d

     var a = Qt.vector3d(1,2,3);
     var b = Qt.vector3d(4,5,6);
     var c = a.times(b);
     console.log(c.toString()); // QVector3D(4, 10, 18)

vector3d times(real factor)

Returns the vector3d result of multiplying `this` vector3d with the scalar `factor`

     var a = Qt.vector3d(1,2,3);
     var b = 4.48;
     var c = a.times(b);
     console.log(c.toString()); // QVector3D(4.48, 8.96, 13.44)

vector3d plus(vector3d other)

Returns the vector3d result of the addition of `this` vector3d with the `other` vector3d

     var a = Qt.vector3d(1,2,3);
     var b = Qt.vector3d(4,5,6);
     var c = a.plus(b);
     console.log(c.toString()); // QVector3D(5, 7, 9)

vector3d minus(vector3d other)

Returns the vector3d result of the subtraction of `other` vector3d from `this` vector3d

     var a = Qt.vector3d(1,2,3);
     var b = Qt.vector3d(4,5,6);
     var c = a.minus(b);
     console.log(c.toString()); // QVector3D(-3, -3, -3)

vector3d normalized()

Returns the normalized form of `this` vector

     var a = Qt.vector3d(1,2,3);
     var b = a.normalized();
     console.log(b.toString());
     // QVector3D(0.267261, 0.534522, 0.801784)

real length()

Returns the scalar real value of the length of `this` vector3d

     var a = Qt.vector3d(1,2,3);
     var b = a.length();
     console.log(b.toString()); // 3.7416573867739413

vector2d toVector2d()

Returns the vector2d result of converting `this` vector3d to a vector2d

     var a = Qt.vector3d(1,2,3);
     var b = a.toVector2d();
     console.log(b.toString()); // QVector2D(1, 2)

vector4d toVector4d()

Returns the vector4d result of converting `this` vector3d to a vector4d

     var a = Qt.vector3d(1,2,3);
     var b = a.toVector4d();
     console.log(b.toString()); // QVector4D(1, 2, 3, 0)

bool fuzzyEquals(vector3d other, real epsilon)

Returns true if `this` vector3d is approximately equal to the `other` vector3d. The approximation will be true if each attribute of `this` is within `epsilon` of `other`. Note that `epsilon` is an optional argument, the default `epsilon` is 0.00001.

     var a = Qt.vector3d(1,2,3);
     var b = Qt.vector3d(1.0001, 1.9998, 2.0001);
     var c = a.fuzzyEquals(b);        // default epsilon
     var d = a.fuzzyEquals(b, 0.005); // supplied epsilon
     console.log(c + " " + d); // false true

This basic type is provided by the QtQuick import.

See also QML Basic Types.