multVecMatrix()

src/cg/testing.ts

@@ -4,22 +4,43 @@ import { vecLength } from "./utils";
 import { vecDotProduct } from "./utils";
 import { vecAngle } from "./utils";
 import { vecCrossProduct } from "./utils";
+import { multVecMatrix } from "./utils";
 
 const pg = new Playground();
 
 // Some vectors
-const v = [1,0,1]
-const w = [0,2,2]
+const v = [1,1,1]
 
-const cp = vecCrossProduct(w, v);
+// Some matrices
+
+const m = [
+    1,2,4,
+    4,5,6,
+    3,2,1
+]
+
+const n = [
+    1,4,3,
+    2,5,2,
+    4,6,1
+]
+
+const o = [
+    -3,-4,-5,
+    -2,-3,-6,
+    -1,-5,-4
+]
+// Calculations
+
+const vm = multVecMatrix(v, m);
+const vn = multVecMatrix(v, n);
+const vo = multVecMatrix(v, o);
 
 // Visualize
 pg.gridXZ(); // Grid
 
-pg.visVector(v,{color:"orange",label:"V"});
-pg.visVector(w,{color:"red",label:"W"});
-pg.visVector(cp,{color:"grey",label:"crossproduct"})
+pg.visVector(v,{color:"black",label:"V"});
+pg.visVector(vm,{color:"red",label:"VM"});
+pg.visVector(vn,{color:"green",label:"VN"});
+pg.visVector(vo,{color:"blue",label:"VO"});
 
-console.log("v length:" + vecLength(v));
-console.log("w length:" + vecLength(w));
-console.log("normalized dotProduct:" + vecDotProduct(vecNormalize(v), vecNormalize(w)));

src/cg/utils.ts

@@ -86,7 +86,13 @@ export function matrixProduct(a: Array<number>, b: Array<number>){
         //row 2
         a[3]*b[0] + a[4]*b[3] + a[5]*b[6], a[3]*b[1] + a[4]*b[4] + a[5]*b[7], a[3]*b[2] + a[4]*b[5] + a[5]*b[8],
         //row 3
-        a[6]*b[0] + a[7]*b[3] + a[8]*b[6], a[6]*b[1] + a[7]*b[4] + a[8]*b[7], a[6]*b[2] + a[7]*b[5] + a[8]*b[8],
+        a[6]*b[0] + a[7]*b[3] + a[8]*b[6], a[6]*b[1] + a[7]*b[4] + a[8]*b[7], a[6]*b[2] + a[7]*b[5] + a[8]*b[8]
+    ]
+}
+
+export function multVecMatrix(v: Array<number>, m: Array<number>){
+    return [
+        v[0]*m[0] + v[1]*m[3] + v[2]*m[6], v[0]*m[1] + v[1]*m[4] + v[2]*m[7], v[0]*m[2] + v[1]*m[5] + v[2]*m[8]
     ]
 }
 //
\ No newline at end of file