1 files changed, 9 insertions, 3 deletions
diff --git a/frontend/_shared/math/line2.js b/frontend/_shared/math/line2.js
index d8ab096..a9e72be 100644
--- a/frontend/_shared/math/line2.js
+++ b/frontend/_shared/math/line2.js
@@ -7,7 +7,7 @@
  * @param {vec2} pEnd 
  * @param {WebGLRenderingContext} pGl
  */
-function line2(pStart, pEnd, pGl, pColor, pThickness) {
+function line2(pStart, pEnd, pGl, pColor, pMass) {
     const lDiffVector = subVec2(pEnd, pStart);
 
     const lBuffer = pGl.createBuffer();
@@ -28,12 +28,18 @@ function line2(pStart, pEnd, pGl, pColor, pThickness) {
         start: pStart,
         end: pEnd,
         slope: lSlope,
-        angle: Math.atan(lSlope),
+        normal: normalize2(getPerp2(lDiffVector)),
         length: length2(lDiffVector),
-        direction: normalize2(lDiffVector)
+        mass: pMass,
+        direction: normalize2(lDiffVector),
+        velocity: vec2(0, 0)
     };
 }
 
+function getLine2MomentOfInertia(pLine) {
+    return (1.0 / 12.0) * pLine.mass * Math.pow(pLine.length, 2);
+}
+
 function renderLine2(pGl, pProgramInfo, pLine) {
     pGl.uniformMatrix4fv(pProgramInfo.uniformLocations.model, false, mat4()); // Model on a line is always default matrix
     pGl.bindBuffer(pGl.ARRAY_BUFFER, pLine.buffer);