# setModelMatrix function

Constructs an OpenGL model matrix in `modelMatrix`

.
Model transformation is the inverse of the view transformation.
Model transformation is also known as "camera" transformation.
Model matrix is commonly used to compute a object location/orientation into
the full model-view stack.

`forwardDirection`

specifies the direction of the forward vector.
`upDirection`

specifies the direction of the up vector.
`tx`

,`ty`

,`tz`

specifies the position of the object.

## Implementation

```
void setModelMatrix(Matrix4 modelMatrix, Vector3 forwardDirection,
Vector3 upDirection, double tx, double ty, double tz) {
final right = forwardDirection.cross(upDirection)..normalize();
final c1 = right;
final c2 = upDirection;
final c3 = -forwardDirection;
modelMatrix.setValues(c1[0], c1[1], c1[2], 0.0, c2[0], c2[1], c2[2], 0.0,
c3[0], c3[1], c3[2], 0.0, tx, ty, tz, 1.0);
}
```