fixed negative distance in voxel traversing

src/renderer/buffers/uniform_buffer.rs

@@ -7,7 +7,8 @@ use wgpu::util::DeviceExt;
 pub struct UniformValues {
     view_inv: [[f32; 4]; 4],
     proj_inv: [[f32; 4]; 4],
-    cam_pos: [f32; 3]
+    cam_pos: [f32; 3],
+    time: f32
 }
 
 impl UniformValues {
@@ -16,10 +17,11 @@ impl UniformValues {
         Self::default()
     }
 
-    pub fn update(&mut self, camera: &Camera) {
+    pub fn update(&mut self, camera: &Camera, time: f32) {
         self.view_inv = camera.view_matrix().invert().unwrap().into();
         self.proj_inv = camera.proj_matrix().invert().unwrap().into();
         self.cam_pos = camera.position.into();
+        self.time = time;
     }
 }