Say that I have 2 points in 3 dimensional space specified in Euclidean coordinates $p_0(x_0,y_0,z_0)$ and $p_1(x_1,y_1,z_1)$. How would I go about finding the coordinates of an unknown point that lies on the line segment from $p_0$ to $p_1$ that is a known Euclidean distance $d$ from $p0$?
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Pretty simple you just have to find the vector between the two points
now since you know the total distance between $p_0$ and $p_1$ (which is $\|v\|$) and the distance to your $p_d$ (which is just $d$):