public static AngularTransition Create(quaternion displacement, quaternion velocity, float durationInSeconds, float inverseDeltaTime)
{
float angle;
var axis = Missing.axisAngle(displacement, out angle);
if (angle < 0.0f)
{
angle = -angle;
axis = -axis;
velocity = Missing.negate(velocity);
}
angle %= 2.0f * math.PI;
var x0 = angle;
var x1 = 2.0f * math.atan(
math.dot(velocity.value.xyz, axis) /
velocity.value.w);
var v0 = (x0 - x1) * inverseDeltaTime;
v0 = math.min(v0, 0.0f);
var transition = ScalarTransition.Create(x0, v0, durationInSeconds);
return(new AngularTransition
{
t = 0.0f,
axis = axis,
transition = transition
});
}
public static LinearTransition Create(float3 displacement, float3 velocity, float durationInSeconds, float inverseDeltaTime)
{
var axis = math.normalizesafe(displacement);
var x0 = math.length(displacement);
var x1 = math.length(math.dot(axis, velocity));
var v0 = (x0 - x1) * inverseDeltaTime;
v0 = math.min(v0, 0.0f);
var transition = ScalarTransition.Create(x0, v0, durationInSeconds);
return(new LinearTransition
{
t = 0.0f,
axis = axis,
transition = transition
});
}
