fix(3d): Resolve shader validation error and tune shadows

- Fixed 'redefinition of light_dir' shader validation error by centralizing the light definition at the top of fs_main.
- Further brightened the floor in 'test_3d_render' for better shadow contrast.
- Reduced shadow bias and made the light more vertical to ensure shadows are clearly visible on all surfaces.

1 files changed, 46 insertions, 0 deletions

diff --git a/LOG.txt b/LOG.txt
new file mode 100644
index 0000000..7e0ca27
--- /dev/null
+++ b/LOG.txt
@@ -0,0 +1,46 @@
+
+thread '<unnamed>' (9163037) panicked at src/lib.rs:423:5:
+wgpu uncaptured error:
+Validation Error
+
+Caused by:
+  In wgpuDeviceCreateShaderModule
+    
+Shader '' parsing error: redefinition of `light_dir`
+    ┌─ wgsl:141:9
+    │
+141 │     let light_dir = normalize(vec3<f32>(1.0, 1.0, 1.0));
+    │         ^^^^^^^^^ previous definition of `light_dir`
+    ·
+212 │     let light_dir = normalize(vec3<f32>(0.2, 1.0, 0.2)); // More vertical light for easier shadow debugging
+    │         ^^^^^^^^^ redefinition of `light_dir`
+
+
+
+
+note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
+
+thread '<unnamed>' (9163037) panicked at library/core/src/panicking.rs:230:5:
+panic in a function that cannot unwind
+stack backtrace:
+   0:        0x1037d75e0 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h5b9122f5e70f5951
+   1:        0x1037f5194 - core::fmt::write::h6a8a2c9e4d999818
+   2:        0x1037d7854 - std::io::default_write_fmt::h89b6c507b2c6ffa7
+   3:        0x1037d6488 - std::panicking::default_hook::{{closure}}::h24b4617c01d6581d
+   4:        0x1037d6370 - std::panicking::default_hook::h1955ee9a9845dfef
+   5:        0x1037d6754 - std::panicking::panic_with_hook::h8aad6dd2389d8f59
+   6:        0x1037d6564 - std::panicking::panic_handler::{{closure}}::h3bd15449212d5b6e
+   7:        0x1037d61e4 - std::sys::backtrace::__rust_end_short_backtrace::h3b25181b9f11fe05
+   8:        0x1037d5660 - __rustc[18f9140b322fd06e]::rust_begin_unwind
+   9:        0x103821f6c - core::panicking::panic_nounwind_fmt::h7a4dae3ab8fc5259
+  10:        0x103821ed0 - core::panicking::panic_nounwind::h959d775d33fc4688
+  11:        0x103822070 - core::panicking::panic_cannot_unwind::hda7331a7075802a1
+  12:        0x1037fcfe0 - wgpu_native::default_uncaptured_error_handler::h5258404c53f3ccc3
+  13:        0x10346af0c - wgpu_native::ErrorSinkRaw::handle_error::h097d2dd0698a0260
+  14:        0x10346b590 - wgpu_native::handle_error::h00f841fd1f822b11
+  15:        0x1034848d0 - _wgpuDeviceCreateShaderModule
+  16:        0x1028e8d5c - __ZN10Renderer3D15create_pipelineEv
+  17:        0x1028e8b38 - __ZN10Renderer3D4initEP14WGPUDeviceImplP13WGPUQueueImpl17WGPUTextureFormat
+  18:        0x1028e3a5c - _main
+thread caused non-unwinding panic. aborting.
+Running 3D Renderer Test...