graphics参考技术文章存档

1.Ray marching

http://jamie-wong.com/2016/07/15/ray-marching-signed-distance-functions/

ShaderToy code: https://www.shadertoy.com/view/XlXfRn

2.Tri-Planar Texture Mapping

https://gamedevelopment.tutsplus.com/articles/use-tri-planar-texture-mapping-for-better-terrain--gamedev-13821

从三个方向分别映射，然后blend

vec3 texCube( sampler2D sam, in vec3 p, in vec3 n ){        vec4 xaxis = texture( sam, p.yz)*abs(n.x);    vec4 yaxis = texture( sam, p.xz)*abs(n.y);    vec4 zaxis = texture( sam, p.xy)*abs(n.z);        vec4 tex = xaxis+yaxis+zaxis;    return vec3(tex.x,tex.y,tex.z);}