Close up no longer falls apart: how near the nearest thing is goes by each object's box (not a ball round it: inside a big or long flat one's ball it came to nothing, the near plane with it, and surfaces fought each other in blocks, jittering, the sky and grid gone), the near plane a quarter of the way to it; reference pictures count too. Grid lines meet exactly where their pieces join (no crawling dots): a streak's ends each face the eye, each its own width; pieces a quarter further from the eye each. The depth pre-pass waited on before the scene uses it; the same depth in both (invariant)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

engine/render/renderer.cpp

@@ -211,14 +211,14 @@ void Renderer::drawSprite(const glm::vec3& at, float size, const glm::vec4& colo
     list.push_back({glm::vec4(at, size * 0.5f), color, glm::vec4(0, 0, 0, rotation), glm::vec4(0, 0, 0, tex)});
 }
 
-void Renderer::drawStreak(const glm::vec3& from, const glm::vec3& to, float width, const glm::vec4& color, TextureId texture, bool additive) {
+void Renderer::drawStreak(const glm::vec3& from, const glm::vec3& to, float width, const glm::vec4& color, TextureId texture, bool additive, float widthTo) {
     auto& list = additive ? packet_.glowSprites : packet_.sprites;
     if (list.size() >= 8192) return;
     uint32_t bits = texture;
     float tex;
     std::memcpy(&tex, &bits, 4);
-    // up.xyz: half its length along it (non-zero marks a streak; its side is found per frame).
-    list.push_back({glm::vec4((from + to) * 0.5f, width * 0.5f), color, glm::vec4(0.0f), glm::vec4((to - from) * 0.5f, tex)});
+    // up.xyz: half its length along it (non-zero marks a streak); right.w: half its width at `to`.
+    list.push_back({glm::vec4((from + to) * 0.5f, width * 0.5f), color, glm::vec4(0.0f, 0.0f, 0.0f, (widthTo < 0.0f ? width : widthTo) * 0.5f), glm::vec4((to - from) * 0.5f, tex)});
 }
 
 void Renderer::drawModel(ModelId model, const glm::mat4& transform, const glm::vec4& tint, const std::vector<glm::mat4>* skin,
@@ -757,11 +757,9 @@ void Renderer::buildPacket(uint32_t width, uint32_t height) {
                         up = glm::cross(right, f);
         for (auto* list : {&p.sprites, &p.glowSprites})
             for (gpu::Sprite& s : *list) {
-                if (const glm::vec3 half(s.up); glm::dot(half, half) > 0.0f) { // a streak: its side faces the eye
-                    glm::vec3 side = glm::cross(half, camera_.origin - glm::vec3(s.posSize));
-                    side = glm::length(side) > 1e-6f ? glm::normalize(side) : right;
-                    s.right = glm::vec4(side * s.posSize.w, 0.0f);
-                    s.posSize.w = 1.0f;
+                if (const glm::vec3 half(s.up); glm::dot(half, half) > 0.0f) { // a streak: each end's side faces the eye (sprite.vert)
+                    s.right = glm::vec4(camera_.origin, s.right.w);
+                    s.posSize.w = -std::max(s.posSize.w, 1e-9f); // (below 0: a streak; its half width at `from`)
                     continue;
                 }
                 s.right = glm::vec4(right, s.right.w), s.up = glm::vec4(up, s.up.w);