From 32614f73cc78b6c2aa0d1381cb62b583f4fde6fc Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Sat, 21 Feb 2026 07:08:47 +0100
Subject: refine scene1 shader

---
 src/effects/scene1_effect.cc        | 10 +++++++---
 workspaces/main/shaders/scene1.wgsl | 16 +++-------------
 2 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/src/effects/scene1_effect.cc b/src/effects/scene1_effect.cc
index da2797c..71e25a4 100644
--- a/src/effects/scene1_effect.cc
+++ b/src/effects/scene1_effect.cc
@@ -7,11 +7,13 @@
 #include "util/fatal_error.h"
 #include "util/mini_math.h"
 
-static CameraParams make_scene1_camera() {
+static CameraParams make_scene1_camera(float time) {
   const float TAU = 6.283185307f;
-  const vec3 ro(0.0f, 2.5f, 5.0f);
+  const float R = 6.0f;
+  const vec3 ro(R * sin(time * .43), 2.5f, R * cos(time * .43));
   const vec3 la(0.0f, 0.0f, 0.0f);
   const vec3 up(0.1f, 1.0f, 0.0f);
+
   CameraParams cam;
   cam.inv_view = mat4::look_at(ro, la, up).inverse();
   cam.fov = TAU / 6.0f;  // full vfov=60°; tan(fov/2)=tan(PI/6)=1/sqrt(3)=1/shader_fov
@@ -31,7 +33,7 @@ Scene1::Scene1(const GpuContext& ctx, const std::vector<std::string>& inputs,
   create_dummy_scene_texture();
 
   camera_params_.init(ctx_.device);
-  camera_params_.update(ctx_.queue, make_scene1_camera());
+  camera_params_.update(ctx_.queue, make_scene1_camera(start_time));
 
   pipeline_.set(create_post_process_pipeline(
       ctx_.device, WGPUTextureFormat_RGBA8Unorm, scene1_shader_wgsl));
@@ -40,6 +42,8 @@ Scene1::Scene1(const GpuContext& ctx, const std::vector<std::string>& inputs,
 void Scene1::render(WGPUCommandEncoder encoder,
                     const UniformsSequenceParams& params,
                     NodeRegistry& nodes) {
+
+  camera_params_.update(ctx_.queue, make_scene1_camera(params.time));
   WGPUTextureView output_view = nodes.get_view(output_nodes_[0]);
 
   pp_update_bind_group(ctx_.device, pipeline_.get(), bind_group_.get_address(),
diff --git a/workspaces/main/shaders/scene1.wgsl b/workspaces/main/shaders/scene1.wgsl
index e98fae6..a47413b 100644
--- a/workspaces/main/shaders/scene1.wgsl
+++ b/workspaces/main/shaders/scene1.wgsl
@@ -26,8 +26,6 @@ fn rayPlane(ray: Ray, plane: vec4<f32>) -> f32 {
   return -(dot(ray.origin, plane.xyz) + plane.w) / dot(ray.direction, plane.xyz);
 }
 
-var<private> g_rot0: mat2x2<f32>;
-
 fn render0(ray: Ray) -> vec3<f32> {
   var col = vec3<f32>(0.0);
   let y = abs(ray.direction.y);
@@ -54,11 +52,7 @@ const OBJ_CUBE: f32 = 1.0;
 const OBJ_SPHERE: f32 = 2.0;
 const OBJ_PLANE: f32 = 3.0;
 
-fn df(p_in: vec3<f32>) -> f32 {
-  var p = p_in;
-  p.x = p_in.x * g_rot0[0][0] + p_in.z * g_rot0[0][1];
-  p.z = p_in.x * g_rot0[1][0] + p_in.z * g_rot0[1][1];
-
+fn df(p: vec3<f32>) -> f32 {
   // Cube
   var pc = p - vec3<f32>(-1.9, 0.0, 0.0);
   let dCube = sdBox(pc, vec3<f32>(1.6));
@@ -77,11 +71,7 @@ fn df(p_in: vec3<f32>) -> f32 {
   return d;
 }
 
-fn dfWithID(p_in: vec3<f32>) -> RayMarchResult {
-  var p = p_in;
-  p.x = p_in.x * g_rot0[0][0] + p_in.z * g_rot0[0][1];
-  p.z = p_in.x * g_rot0[1][0] + p_in.z * g_rot0[1][1];
-
+fn dfWithID(p: vec3<f32>) -> RayMarchResult {
   // Cube
   var pc = p - vec3<f32>(-1.9, 0.0, 0.0);
   let dCube = sdBox(pc, vec3<f32>(1.6));
@@ -177,7 +167,7 @@ fn render1(ray: Ray) -> vec3<f32> {
 }
 
 fn effect(p: vec2<f32>) -> vec3<f32> {
-  g_rot0 = rot(-0.2 * uniforms.time);
+//  g_rot0 = rot(-0.2 * uniforms.time);
   let ray = getCameraRay(camera, p);
   return render1(ray);
 }
-- 
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