Open GL Mathematics - Code Samples

Code Samples

// Compute a triangle normal: # include void computeNormal(triangle & Triangle) { glm::vec3 const & a = Triangle.Position; glm::vec3 const & b = Triangle.Position; glm::vec3 const & c = Triangle.Position; Triangle.Normal = glm::normalize(glm::cross(c - a, b - a)); } // Matrix transform: # include // glm::vec3, glm::vec4, glm::ivec4, glm::mat4 # include // glm::perspective # include // glm::translate, glm::rotate, glm::scale # include // glm::value_ptr void transform { glm::mat4 Projection = glm::perspective(45.0f, 4.0f / 3.0f, 0.1f, 100.f); glm::mat4 ViewTranslate = glm::translate(glm::mat4(1.0f), glm::vec3(0.0f, 0.0f, -Translate)); glm::mat4 ViewRotateX = glm::rotate(ViewTranslate, Rotate.y, glm::vec3(-1.0f, 0.0f, 0.0f)); glm::mat4 View = glm::rotate(ViewRotateX, Rotate.x, glm::vec3(0.0f, 1.0f, 0.0f)); glm::mat4 Model = glm::scale(glm::mat4(1.0f), glm::vec3(0.5f)); glm::mat4 MVP = Projection * View * Model; glUniformMatrix4fv(LocationMVP, 1, GL_FALSE, glm::value_ptr(MVP)); }

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