working intersection - rotating simplex

simplex/shaders/wire.geom

@@ -0,0 +1,37 @@
+#version 440 core
+
+layout(points) in;
+layout(line_strip, max_vertices=48) out;
+
+layout(std430, binding=1) buffer Positions {
+    vec4 verts[];
+};
+
+layout(std140, binding=1) uniform Matrices {
+    mat4 model;
+    mat4 view;
+    mat4 proj;
+};
+
+in ivec4 inds[];
+
+out vec4 pos;
+
+void emit(vec4 v) {
+    pos = v;
+    gl_Position = proj * view * vec4(v.xyz, -v.w + 2);
+    EmitVertex();
+}
+
+void main() {
+    vec4 pos4[4];
+    for(int i = 0; i < 4; ++i) pos4[i] = model * verts[inds[0][i]];
+
+    for(int i = 0; i < 4; ++i) {
+        for(int j = i + 1; j < 4; ++j) {
+            emit(pos4[i]);
+            emit(pos4[j]);
+            EndPrimitive();
+        }
+    }
+}