View Full Version : Correctly Moving along a path

Durga Prasad
01-04-2016, 08:22 PM
I am trying orient the camera on a predefined path by continuously updating camera position and target location.
I do see some movement but does not seem to be right.How to ensure that the camera always looks ahead the path?
The example I am trying to modify is here (http://learnopengl.com/code_viewer.php?code=getting-started/camera_with_class)

int i = 0;
vPathPoints=GetPathPoints();//Custom function to load path data(smooth curve)

// Game loop
while (!glfwWindowShouldClose(window))
//Code from the camera sample.
camera.Position = glm::vec3(vPathPoints[i].x, vPathPoints[i].y, vPathPoints[i].z);
camera.Front = glm::vec3(vPathPoints[i + 1].x, vPathPoints[i + 1].y, vPathPoints[i + 1].z);
// Create camera transformation
glm::mat4 view;
view = camera.GetViewMatrix();
glm::mat4 projection;
projection = glm::perspective(camera.Zoom, (float)screenWidth / (float)screenHeight, 0.1f, 10000.0f);
// Get the uniform locations
GLint modelLoc = glGetUniformLocation(ourShader.Program, "ModelMatrix");
GLint viewLoc = glGetUniformLocation(ourShader.Program, "ViewMatrix");
GLint projLoc = glGetUniformLocation(ourShader.Program, "ProjectionMatrix");
// Pass the matrices to the shader
glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
// Calculate the model matrix for each object and pass it to shader before drawing
glm::mat4 model;
model = glm::translate(model, cubePositions[0]);
GLfloat angle = 0.0f; // For now no rotation required ???
model = glm::rotate(model, angle, glm::vec3(1.0f, 0.0f, 0.0f));
glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));