From c9041e2e6fe59d6127bb1085b874e8e3cda8000e Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Thu, 7 May 2026 10:12:11 -0400
Subject: more intense position-relative rendering to fix some precision
 problems

---
 assets/shaders/tacmap/body.wgsl | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

(limited to 'assets/shaders/tacmap/body.wgsl')

diff --git a/assets/shaders/tacmap/body.wgsl b/assets/shaders/tacmap/body.wgsl
index e91c841..0cfd5f9 100644
--- a/assets/shaders/tacmap/body.wgsl
+++ b/assets/shaders/tacmap/body.wgsl
@@ -6,14 +6,16 @@ struct InstanceInput {
 
 struct VertexOutput {
     @builtin(position) clip_position: vec4<f32>,
-    @location(0) local_position: vec3<f32>
+    @location(0) local_position: vec3<f32>,
+    @location(1) distance: f32
 };
 
 struct CameraUniform {
     view: mat4x4<f32>,
     proj: mat4x4<f32>,
-    pos: vec3<f32>,
-    scale: f32
+    abs_pos: vec3<f32>,
+    rel_pos: vec3<f32>,
+    scale: f32,
 };
 
 @group(0) @binding(0)
@@ -49,18 +51,18 @@ fn vs_main(
     //Scale the world around the camera scale and translate about the camera's
     //absolute (/target) position
     let relative_pos = instance.position;
-    let origin_pos = (instance.origin - camera.pos);
+    let origin_pos = instance.origin - camera.abs_pos;
 
-    if all(relative_pos != origin_pos) {
+    /*if all(relative_pos != origin_pos) {
         if length(relative_pos) < 0.01 / camera.scale {
             if length(relative_pos) != 0.0 {
                 out.clip_position = vec4<f32>(0.0, 0.0, 0.0, 1.0);
                 return out;
             }
         }
-    }
+    }*/
 
-    let instance_pos = (relative_pos + origin_pos) * camera.scale;
+    let instance_pos = (relative_pos + origin_pos - camera.rel_pos) * camera.scale;
 
     let view_proj = camera.proj * view;
 
@@ -76,6 +78,7 @@ fn vs_main(
     }
 
     out.local_position = model;
+    out.distance = length(instance_pos);
 
     return out;
 }
@@ -88,5 +91,6 @@ fn fs_main(in: VertexOutput
     if point_dist > 1.0 {
         alpha = 0.0;
     }
-    return vec4<f32>(1.0, 1.0, 1.0, alpha);
+    let color = vec3<f32>(1.0, 1.0, 1.0) / clamp(in.distance, 1.0, 1.5);
+    return vec4<f32>(color, alpha);
 }
-- 
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