translucent wireframe

vis/shaders/solid.fs.glsl

@@ -1,6 +1,6 @@
 #version 430
 
-layout(location=2) uniform vec3 c;
+layout(location=2) uniform vec4 c;
 
 in vec4 pos;
 
@@ -8,5 +8,5 @@ out vec4 color;
 
 void main() {
     float d = smoothstep(-2, 2, pos.z);
-    color = vec4(c * d, 1);
+    color = vec4(c.xyz * d, c.w);
 }

vis/src/main.cpp

@@ -141,6 +141,8 @@ void run(GLFWwindow *window) {
     glEnable(GL_DEPTH_TEST);
 //    glEnable(GL_CULL_FACE);
     glCullFace(GL_BACK);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
     Shaders sh;
 
@@ -204,15 +206,15 @@ void run(GLFWwindow *window) {
 
         glLineWidth(1.5);
 
-        glProgramUniform3f(sh.solid, 2, 0.3, 0.3, 0.3);
-        proj_pipe.bound([&]() {
-            wires.draw_direct();
-        });
-
         slice_pipe.bound([&]() {
             slices.draw_deferred();
         });
 
+        glProgramUniform4f(sh.solid, 2, 0.3, 0.3, 0.3, 0.4);
+        proj_pipe.bound([&]() {
+            wires.draw_direct();
+        });
+
         glfwSwapInterval(2);
         glfwSwapBuffers(window);