.. _program_listing_file_Src_GraphicsEngineVulkan_common_GuiModelTransform.hpp:

Program Listing for File GuiModelTransform.hpp
==============================================

|exhale_lsh| :ref:`Return to documentation for file <file_Src_GraphicsEngineVulkan_common_GuiModelTransform.hpp>` (``Src/GraphicsEngineVulkan/common/GuiModelTransform.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #pragma once
   
   #include <span>
   
   #include <glm/glm.hpp>
   #include <glm/gtc/matrix_transform.hpp>
   
   namespace Kataglyphis {
   
   // Builds the model matrix the GUI's Position/Rotation drag widgets apply to
   // scene model 0. There is deliberately NO scale factor: SceneConfig.cpp's
   // getModelMatrix() documents that the old hard-coded 60x scale put the
   // camera inside the tiny viking_room mesh (all backfaces, culled -> black
   // viewport) and stretched the scene far beyond a cascade's useful
   // resolution. Dinosaurs (debug) and crytek-sponza (release) both need no
   // scaling, so this helper must not reintroduce one.
   //
   // Order: start from identity, write position directly into the translation
   // column (NOT scaled - matches the original handler), then apply rotation
   // Z, then Y, then X, each via glm::rotate on the running matrix.
   inline auto makeGuiModelTransform(
     std::span<const float, 3> position, std::span<const float, 3> rotationDegrees) -> glm::mat4
   {
       glm::mat4 modelMatrix = glm::mat4(1.0f);
   
       modelMatrix[3] = glm::vec4(position[0], position[1], position[2], 1.0f);
   
       modelMatrix = glm::rotate(modelMatrix, glm::radians(rotationDegrees[2]), glm::vec3(0.0f, 0.0f, 1.0f));
       modelMatrix = glm::rotate(modelMatrix, glm::radians(rotationDegrees[1]), glm::vec3(0.0f, 1.0f, 0.0f));
       modelMatrix = glm::rotate(modelMatrix, glm::radians(rotationDegrees[0]), glm::vec3(1.0f, 0.0f, 0.0f));
   
       return modelMatrix;
   }
   
   }// namespace Kataglyphis