Using bitmap textures with BOOGA
Besides the shading language, bitmap textures are one of the most powerful rendering
methods in computer graphics.
PolygonMapper BSDL language extension
The Polygonmapper BSDL language extension was originally implemented by Thierry Mattey
as a BOOGA shader using the shading language. Bernhard Bühlmann implemented the
Polgonmapper texture in C++ and adapted the OpenGL rendering engine. Both raytracing and
OpenGL rendering now produce the same results when using bitmap textures.
The syntax of Polygonmapper
polygonmapper ("image.jpg", sx, sy, alpha, [tx, ty], [nx,ny,nz]) {
specular (r,g,b);
specpow s;
ambient (r,g,b);
reflectivity r;
}
| sx, sy |
scaling of the texture coordinates (default: 1,1). |
| alpha |
angle of rotation of texture coordinates (default: 0). |
| [tx,ty] |
2D translation vector of texture coordinates. |
| [nx,ny,nz] |
normal vector of the plane, to which the texture is mapped. |
| specular(r,g,b) |
Specular RGB color as in Phong model |
| specpow s |
s is teh size of the highlights on the objects. Values from
1-10 produce small highlights, valuse from 11-60 smaller ones. |
| reflectivity r |
r is the reflectivity of the bitmap. Values close to 0.0
apply no reflecticity, values towards 1.0 produce a mirror effect. |
Example
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