13. glm::scale

• When using glm::scale( X, vec3 ), you are multiplying

  
      X * glm::scale( Identity, vec3 )
  
  

• For example,

  
      glm::mat4 transMatrix = glm::translate(
          glm::mat4( 1.0f ),
          glm::vec3( 0.0f, -0.5f, 0.0f )
          );
  
      planeModel->mM = glm::scale(  // Scale first
          transMatrix,              // Translate second
          glm::vec3( 100.0f, 100.0f, 100.0f )
          );
  
  

• Far all GLM transformation API, see GLM_GTC_matrix_transform at glm.g-truc.net