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//
// Grid rendering
//
// Copyright (c) 2021 Dan Gudmundsson
//
// See the file "license.terms" for information on usage and redistribution
// of this file, and for a DISCLAIMER OF ALL WARRANTIES.
//
//
#version 120
uniform mat4 view;
uniform mat4 proj;
uniform float dist;
uniform vec3 ws_eyepoint;
uniform vec3 ws_origin;
uniform int along;
varying vec3 pos3d;
varying vec2 pos2d;
void main(void)
{
// Convert xy screenspace to {-1.0,-1.0,1.0,1.0}
vec4 p = gl_ModelViewProjectionMatrix * vec4(gl_Vertex.xyz, 1.0);
pos2d = p.xy;
float min_scale = 1.0;
float trnsl = 0.95; // Don't put plane on-top of what you are looking at
// Make a large plane in world space
float scale;
if(along == 0) {
scale = max((abs(ws_eyepoint.y)+abs(dist))*2, min_scale);
p = vec4(p.x*scale-ws_origin.x, -0.000, p.y*scale-ws_origin.z, 1.0);
pos3d = p.xyz;
} else if(along == 1) {
scale = max((abs(ws_eyepoint.x)+abs(dist))*2, min_scale);
p = vec4(-ws_origin.x*trnsl, p.x*scale-ws_origin.y, p.y*scale-ws_origin.z, 1.0);
pos3d = p.zxy;
} else if(along == 3) {
scale = max((abs(ws_eyepoint.z)+abs(dist))*2, min_scale);
p = vec4(p.x*scale-ws_origin.x, p.y*scale-ws_origin.y, -ws_origin.z*trnsl, 1.0);
pos3d = p.xzy;
} else if(along == 2) {
scale = max((abs(ws_eyepoint.y)+abs(dist))*2, min_scale);
p = vec4(p.x*scale-ws_origin.x, -ws_origin.y*trnsl, p.y*scale-ws_origin.z, 1.0);
pos3d = p.xyz;
}
// Translate plane to 3d space according to camera and proj
gl_Position = proj * view * p;
}
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