Implement noise texture generation in the fragment shader

Assignment Help Computer Graphics

Reference no: EM132411476

Procedural Landscape Generation

You will use procedural methods to generate a virtual landscapes. The project can be divided into the following three parts.
• geometry (mesh generation, procedural height generation)
• rendering (terrain shading, texturing)
• animation (camera animation)
Each of these parts are subdivided into basic and advanced tasks.

Geometry
• create a flat (z=0) triangular mesh. Do so using GL_TRIANGLE STRIP, making use of GL_PRIMITIVE RESTART
• implement Perlin noise on the CPU (see noise.h)
• generate a height map texture using fBm (read this tutorial on fractional Brownian motion)
• use the height map texture to displace grid vertices in the vertex shader

Advanced
• implement noise texture generation in the fragment shader
• implement other noise functions to generate terrain (e.g. hybrid multifractal and ridged multifractal)
• instead of generating a plane world, create a spherical world
• create an infinite world (new tiles on demand, requires GPU noise)
• use L-system to add trees to your terrain
• use noise functions to generate clouds (and integrate participating media in fshader)

Rendering
• calculate surface normals, add diffuse and specular shading.
• use the tile-able textures (shown above) to texture your terrain. In the fshader you can use the normal of a fragment (slope of terrain) and its height to decide which textures to blend. For example, snow does not deposit on very steep slopes, and happens only at a certain height. (Download *.png: grass, rock, sand, snow, water)
• implement the skybox texture using OpenGLscubemap textures. Surround your scene with a cube, and texture this cube to color the sky of your scene. Under Textures folder, you can find miramar_*.png which may be used to create the skybox. You will have to write UV texture coordinates in your C++ code so as to map faces of the cube to the correct portion of the image/texture (reference).

Advanced
• use an OpenGL CubeMap to texture the sky and get rid of artifacts caused by discontinuities in the UV parameterization (5%).
• use the normal map texture (water.png) to represent waves. You can overlap multiple scaled copies of this texture and translate them over time to emulate a water effect (5%).
• add a mirroring eect to the water; this is achieved by mirroring the camera position with respect to the water plane, render your scene in a framebuffer, and placing the texture back in a second step. You can also simulate refraction by blending the mirrored and non-mirrored images according to the incidence angle of your camera w.r.t. water (15%)
• simulate the fact that reflections are affected by water movement by distorting the reflected image with a noise function (5%)

Animation
implement WASD (forward/backward, left/right) camera controls

Advanced
• use a bezier curve to animate the camera path (5%)
• implement a FPS camera, camera height is determined by terrain height (5%)
• use a displacement map to animate waves; the map can be computed numerically as a sum of periodic functions varying over time (10%)
• use particles and billboards to animate 3D snow (10%)

Getting Started
The starter code is filled with TODO comments. The following order of completion is recommended:
• genTerrainMesh() in main.cpp
• drawTerrain() in main.cpp
• lerp(), perlin2D(), and fBm2DTexture in noise.h
• terrain vshader.glsl
• drawSkybox() in main.cpp
• KeyEvent listener callback in main.cpp
• terrain fshader.glsl

Attachment:- Procedural Landscape Generation.rar

Reference no: EM132411476

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