Improve scene rotation behaviour

examples/CMakeLists.txt

@@ -410,6 +410,9 @@ target_link_libraries(rhombo OpenGL::GL glfw Freetype::Freetype)
 add_executable(rhombo_scene rhombo_scene.cpp)
 target_link_libraries(rhombo_scene OpenGL::GL glfw Freetype::Freetype)
 
+add_executable(rhombo_scene2 rhombo_scene2.cpp)
+target_link_libraries(rhombo_scene2 OpenGL::GL glfw Freetype::Freetype)
+
 add_executable(quads quads.cpp)
 target_link_libraries(quads OpenGL::GL glfw Freetype::Freetype)
 

examples/rhombo_scene2.cpp

@@ -0,0 +1,68 @@
+// A scene of rhombohedrons useful for developing scene rotation by user control
+
+#include <sm/vec>
+#include <mplot/Visual.h>
+#include <mplot/RhomboVisual.h>
+#include <mplot/ColourMap.h>
+
+int main()
+{
+    // Create a scene
+    mplot::Visual v(1024, 768, "Rhombohedrons");
+    v.lightingEffects (true);
+
+    // Parameters of the model
+    sm::vec<float, 3> offset = { -1,  0,  0 };   // a within-scene offset
+    sm::vec<float, 3> e1 = { 0.25,  0,  0 };
+    sm::vec<float, 3> e2 = { 0.1,  0.25,  0 };
+    sm::vec<float, 3> e3 = { 0,  0.0,  0.25 };
+    mplot::ColourMap<float> cmap(mplot::ColourMapType::Rainbow);
+
+    // 0
+    offset = { 0, 0, 0 };
+    auto rv = std::make_unique<mplot::RhomboVisual<>> (offset, e1/3, e2/3, e3/3, cmap.convert(0.1f));
+    v.bindmodel (rv);
+    rv->finalize();
+    v.addVisualModel (rv);
+
+    offset = { -2, 0, 0 };
+    rv = std::make_unique<mplot::RhomboVisual<>> (offset, e1, e2, e3, cmap.convert(1.0f));
+    v.bindmodel (rv);
+    rv->finalize();
+    v.addVisualModel (rv);
+
+    offset = { 2, 0, 0 };
+    rv = std::make_unique<mplot::RhomboVisual<>> (offset, e1, e2, e3, cmap.convert(0.5f));
+    v.bindmodel (rv);
+    rv->finalize();
+    v.addVisualModel (rv);
+
+    offset = { 0, 2, 0 };
+    rv = std::make_unique<mplot::RhomboVisual<>> (offset, e1, e2, e3, cmap.convert(0.3333f));
+    v.bindmodel (rv);
+    rv->finalize();
+    v.addVisualModel (rv);
+
+    offset = { 0, -2, 0 };
+    rv = std::make_unique<mplot::RhomboVisual<>> (offset, e1, e2, e3, cmap.convert(0.25f));
+    v.bindmodel (rv);
+    rv->finalize();
+    v.addVisualModel (rv);
+
+    offset = { 0, 0, 2 };
+    rv = std::make_unique<mplot::RhomboVisual<>> (offset, e1, e2, e3, cmap.convert(0.2f));
+    v.bindmodel (rv);
+    rv->finalize();
+    v.addVisualModel (rv);
+
+    offset = { 0, 0, -2 };
+    rv = std::make_unique<mplot::RhomboVisual<>> (offset, e1, e2, e3, cmap.convert(0.1f));
+    v.bindmodel (rv);
+    rv->finalize();
+    v.addVisualModel (rv);
+    v.render();
+
+    v.keepOpen();
+
+    return 0;
+}