merge

1 files changed, 18 insertions, 0 deletions

diff --git a/src/vec4ops/transform4d.cpp b/src/vec4ops/transform4d.cpp
new file mode 100644
index 0000000..5cc51f3
--- /dev/null
+++ b/src/vec4ops/transform4d.cpp
@@ -0,0 +1,18 @@
+#include "vec4ops.h"
+
+// this is used to transform a 4d point by a 4d matrix and its associated translation
+// this is motivated by the fact that glm does not support 5d matrices, so we cannot define a mat5 to encapsulate both the rotation and translation in one matrix
+// therefore, we break the 5d transformation into a 4d rotation and a 4d translation
+glm::vec4 Vec4Ops::transformPoint4(glm::vec4 point4,  glm::mat4 transformDirectionMatrix, glm::vec4 translationPointVector) {
+    // do the translation then direction
+    point4 = transformDirectionMatrix * point4;
+    point4 += translationPointVector;
+    return point4;
+}
+
+glm::vec4 Vec4Ops::inverseTransformPoint4(glm::vec4 point4,  glm::mat4 inverseTransformDirectionMatrix, glm::vec4 inverseTranslationPointVector) {
+    // do the direction then translation
+    point4 += inverseTranslationPointVector;
+    point4 = inverseTranslationPointVector * point4;
+    return point4;
+}
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