Allow vdb_view to print camera transformation matrix

Signed-off-by: Chris Flesher <chris.flesher@gmail.com>
AcademySoftwareFoundation · Apr 15, 2024 · 5253a48 · 5253a48
1 parent 45d2ce4
commit 5253a48
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diff --git a/openvdb_cmd/vdb_view/Camera.cc b/openvdb_cmd/vdb_view/Camera.cc
@@ -44,6 +44,15 @@ Camera::Camera()
 }
 
 
+openvdb::Mat4s
+Camera::getTransformationMatrix()
+{
+    float matrix[16];
+    glGetFloatv(GL_MODELVIEW_MATRIX, matrix);
+    return openvdb::Mat4s(matrix);
+}
+
+
 void
 Camera::lookAt(const openvdb::Vec3d& p, double dist)
 {

diff --git a/openvdb_cmd/vdb_view/Camera.h b/openvdb_cmd/vdb_view/Camera.h
@@ -23,6 +23,8 @@ class Camera
 
     void aim();
 
+    openvdb::Mat4s getTransformationMatrix();
+
     void lookAt(const openvdb::Vec3d& p, double dist = 1.0);
     void lookAtTarget();
 

diff --git a/openvdb_cmd/vdb_view/Viewer.cc b/openvdb_cmd/vdb_view/Viewer.cc
@@ -58,6 +58,7 @@ class ViewerImpl
     void showNextGrid();
 
     bool needsDisplay();
+    void printCameraTransformationMatrix();
     void setNeedsDisplay();
 
     void toggleRenderModule(size_t n);
@@ -992,6 +993,9 @@ ViewerImpl::keyCallback(int key, int action)
         case 'i': case 'I':
             toggleInfoText();
             break;
+        case 'p': case 'P':
+            printCameraTransformationMatrix();
+            break;
         case GLFW_KEY_LEFT:
             showPrevGrid();
             break;
@@ -1084,6 +1088,13 @@ ViewerImpl::needsDisplay()
 }
 
 
+void
+ViewerImpl::printCameraTransformationMatrix()
+{
+    std::cout << mCamera->getTransformationMatrix() << std::endl;
+}
+
+
 void
 ViewerImpl::setNeedsDisplay()
 {

diff --git a/openvdb_cmd/vdb_view/main.cc b/openvdb_cmd/vdb_view/main.cc
@@ -36,6 +36,7 @@ usage [[noreturn]] (const char* progName, int status)
 "    G                  (\"geometry\") look at center of geometry\n" <<
 "    H                  (\"home\") look at origin\n" <<
 "    I                  toggle on-screen grid info on/off\n" <<
+"    P                  print camera transformation matrix\n" <<
 "    left mouse         tumble\n" <<
 "    right mouse        pan\n" <<
 "    mouse wheel        zoom\n" <<