Procedural Animation - Cauldron

This code display a scene in loading some external .obj meshes: A cauldron and a spoon

• Note: The meshes files are stored in the directory assets/. This directory should be accessible from the place where your executable is run.

A set of particles (one displayed as sphere, and the other using a semi-transparent textured mapped onto a quad) are emited regularily.
The goal of this exercise is to modify the code to model a scene similar to the following one.

Bubbles

The particles structures, creation and position update are in the files particles/particles.hpp/cpp. The constructor already creates the bubbles at their expected position.

• - Update the function particle_bubble::evaluate_position() to set the motion of the bubbles.

Smoke billboards

The smoke behavior is obtained using billboards with the semi-transparent smoke texture. To get the expected behavior, you should

• 1) Set the constructor particle_billboard::particle_billboard() to set the correct initial position of the billboards.
• 2) Update the function particle_billboard::evaluate_position() to set the correct trajectory of the billboards.
• 3) Update in the file scene.cpp the function scene_structure::display_billboard() in order to the the billboards facing the camera, and with varying transparency along time.

Liquid surface

The liquid surface is modeled by a grid trimmed to fit a circle. The liquid surface is associated to a dedicated shader in shaders/water. The animation of the liquid can be made in modifying the associated vertex shader shaders/water/water.vert.glsl.

• - A uniform time parameter is passed to the shader and can be used to modify the position of the vertices of the grid.
• - A 2D and 3D simplex noise snoise is available in the shader.
• - The animation of the surface can be obtained by modifying the function float deformation(float x, float z, float t) in the shader.
• • The surface is defined as \(S(x,z)=(x,\text{deformation}(x,z,t),z)\).