cyrstem · May 9, 2018 17:24 · Mar 30, 2018
diff --git a/ofMatrix4x4-vs-glm.cpp b/ofMatrix4x4-vs-glm.cpp
@@ -0,0 +1,37 @@
+#include "ofMain.h"
+
+int main() {
+    // both initialize to identity matrix
+    cout << glm::mat4() << endl;
+    cout << ofMatrix4x4() << endl;
+
+    // both row-major (translation stored in mat[3][0,1,2])
+    glm::mat4 glmMat;
+    glmMat = glm::translate(glmMat, glm::vec3(1,2,3));
+    ofMatrix4x4 ofMat;
+    ofMat.translate(1,2,3);
+    for(int i = 0; i < 4; i++) {
+        cout << glmMat[i] << endl;
+        cout << ofMat._mat[i] << endl;
+    }
+
+    // if working with multiple transformations, note that:
+    // glmMat *= glm::translate(glmMat, translation);
+    // is actually equivalent to:
+    // ofMat.preMultTranslate(translation);
+
+    // also,
+    glm::mat4 glmMat1, glmMat2;
+    glmMat1 *= glmMat2;
+    // is equivalent to:
+    ofMatrix4x4 ofMat1, ofMat2;
+    ofMat1.preMult(ofMat2);
+
+    // glm::eulerAngleX accepts radians
+    // ofMatrix4x4 uses float by default
+    // glm::mat4 can use float or double based on initialization
+    // so we explicitly initialize with a float
+    cout << glm::eulerAngleX(float(HALF_PI)) << endl;
+    // ofMatrix4x4::newRotationMatrix accepts degrees
+    cout << ofMatrix4x4::newRotationMatrix(90, 1, 0, 0) << endl;
+}