[英]Draw the midpoint lines between points
我正在片段着色器中制作生成的形狀,其中一部分涉及繪制對象之間的邊界,即它們之間的分界線。
目前我有:
期望的效果是:
(來源: vinsol.com )
(注意線條繪制的形狀不相關)
但問題是中間有一點突出。
uniform int objects = 0;
uniform vec2 positions[50];
uniform float radii[50];
uniform float meter = 64;
varying vec2 texPos;
uniform vec2 cameraPosition;
uniform float k1 = sqrt(2*50*50); //smoothness of cells
uniform float k2 = sqrt(2*50*50)/2; //smoothness of cell walls
uniform float lineWidth = 6;
#ifdef VERTEX
vec4 position(mat4 transform_projection, vec4 vertex_position)
{
texPos = (cameraPosition + vertex_position.xy);
return transform_projection * vertex_position;
}
#endif
#ifdef PIXEL
float smin( float a, float b, float k )
{
float h = clamp( 0.5+0.5*(b-a)/k, 0.0, 1.0 );
return mix( b, a, h ) - k*h*(1.0-h);
}
vec4 effect( vec4 color, Image tex, vec2 texture_coords, vec2 screen_coords ) {
float finalmin = 0;
float bordermin = 99999;
for (int i = 0; i < objects; i++) {
for (int j = 0; j < i; j++) {
float di = distance(positions[i], texPos) - radii[i];
float dj = distance(positions[j], texPos) - radii[j];
float sm = smin(di, dj, k1);
if (sm < finalmin) {
finalmin = sm;
bordermin = min(abs(di-dj),bordermin);
}
}
}
if (finalmin < 0) {
// if (smin(borderdist, abs(finalmin), k2) < lineWidth) {
if (bordermin < lineWidth) {
color.a = 1;
}
return color;
}
return vec4(0.1,0,0,1);
}
#endif
注意這是love2d glsl,這就是為什么它有點不同
編輯:我解決了我自己的問題
uniform int objects = 0;
uniform vec2 positions[50];
uniform float radii[50];
uniform float meter = 64;
varying vec2 texPos;
uniform vec2 cameraPosition;
uniform float k1 = sqrt(2*50*50); //smoothness of cells
uniform float k2 = sqrt(2*50*50)/4; //smoothness of cell walls
uniform float lineWidth = 6;
#ifdef VERTEX
vec4 position(mat4 transform_projection, vec4 vertex_position)
{
texPos = (cameraPosition + vertex_position.xy);
return transform_projection * vertex_position;
}
#endif
#ifdef PIXEL
float smin( float a, float b, float k )
{
float h = clamp( 0.5+0.5*(b-a)/k, 0.0, 1.0 );
return mix( b, a, h ) - k*h*(1.0-h);
}
vec4 effect( vec4 color, Image tex, vec2 texture_coords, vec2 screen_coords ) {
float finalmin = 0;
float bordermin = 99999;
int closestobj = -1;
float mindist = 99999;
for (int i = 0; i < objects; i++) {
float dist = distance(positions[i], texPos) - radii[i];
if (closestobj == -1 || dist < mindist) {
mindist = dist;
closestobj = i;
}
}
for (int i = 0; i < objects; i++) {
for (int j = 0; j < i; j++) {
float di = distance(positions[i], texPos) - radii[i];
float dj = distance(positions[j], texPos) - radii[j];
float sm = smin(di, dj, k1);
float m = min(di, dj);
if (sm < finalmin) {
finalmin = sm;
if (closestobj == i || closestobj == j) {
bordermin = min(abs(di-dj), bordermin);
}
}
}
}
if (finalmin < 0) {
if (smin(bordermin, abs(finalmin), k2) < lineWidth) {
// if (bordermin < lineWidth) {
color.a = 1;
}
return color;
}
return vec4(0);
}
#endif
基本上我所做的只是渲染兩點之間的中點線,如果這兩點之一是離片段最近的點。
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