diff --git a/Cargo.toml b/Cargo.toml
index 50356f3..ac7088f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,7 @@ assigning_clones = "deny"
 build_raymarch = ["sdfu/ultraviolet", "ultraviolet"]
 color_grad = ["colorgrad"]
 # for scenes with many non-dense meshes, disable sort_mesh_aabb_hits
+pbr = ["dep:pbr"]
 default = [
     "realistic_camera",
     "sort_mesh_aabb_hits",
@@ -55,7 +56,7 @@ num_cpus = "~1.16"
 ordered-float = "~4.2"
 parking_lot = "~0.12"
 paste = "~1.0"
-pbr = "~1.1"
+pbr = { version = "~1.1", optional = true }
 png = "~0.17"
 rand = "~0.8"
 rayon = "~1.10"
diff --git a/src/prelude.rs b/src/prelude.rs
index d36e14b..a426e2a 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -25,3 +25,36 @@ pub use math::traits::{CheckInf, CheckNAN, CheckResult, FromScalar, ToScalar};
 
 pub use std::cmp::Ordering;
 pub use std::f32::consts::{PI, SQRT_2, TAU};
+
+#[cfg(feature = "pbr")]
+pub use pbr::ProgressBar;
+
+// dummy ProgressBar implementation that gets used instead of the actual one, to avoid having to put #[cfg] directives around every use and method call of ProgressBar
+#[cfg(not(feature = "pbr"))]
+use std::io::{Stdout, Write};
+#[cfg(not(feature = "pbr"))]
+use std::marker::PhantomData;
+#[cfg(not(feature = "pbr"))]
+pub struct ProgressBar<T: Write + Send + Sync> {
+    phantom: PhantomData<T>,
+}
+
+#[cfg(not(feature = "pbr"))]
+
+impl ProgressBar<Stdout> {
+    pub fn new(width: u64) -> Self {
+        ProgressBar {
+            phantom: PhantomData,
+        }
+    }
+}
+#[cfg(not(feature = "pbr"))]
+impl<T: Write + Send + Sync> ProgressBar<T> {
+    pub fn on(write: T, total: u64) -> Self {
+        ProgressBar {
+            phantom: PhantomData,
+        }
+    }
+    pub fn add(&mut self, n: u64) {}
+    pub fn finish(&mut self) {}
+}
diff --git a/src/renderer/naive.rs b/src/renderer/naive.rs
index d8ae699..f9ad36b 100644
--- a/src/renderer/naive.rs
+++ b/src/renderer/naive.rs
@@ -14,7 +14,6 @@ use std::time::{Duration, Instant};
 
 use crossbeam::channel::unbounded;
 // use crossbeam::channel::{bounded};
-use pbr::ProgressBar;
 use rayon::iter::ParallelIterator;
 
 #[derive(Default)]
diff --git a/src/renderer/preview.rs b/src/renderer/preview.rs
index a0384e1..5328fc5 100644
--- a/src/renderer/preview.rs
+++ b/src/renderer/preview.rs
@@ -19,7 +19,6 @@ use std::time::{Duration, Instant};
 
 use crossbeam::channel::unbounded;
 use math::spectral::BOUNDED_VISIBLE_RANGE;
-use pbr::ProgressBar;
 
 #[cfg(feature = "preview")]
 use minifb::{Key, Scale, Window, WindowOptions};
diff --git a/src/renderer/tiled.rs b/src/renderer/tiled.rs
index 990e83b..d6ae025 100644
--- a/src/renderer/tiled.rs
+++ b/src/renderer/tiled.rs
@@ -22,7 +22,6 @@ use std::time::{Duration, Instant};
 
 // use crossbeam::channel::unbounded;
 // use crossbeam::channel::bounded;
-use pbr::ProgressBar;
 use rayon::iter::ParallelIterator;
 
 #[derive(Default, Copy, Clone)]
diff --git a/src/world/importance_map.rs b/src/world/importance_map.rs
index 3f9445a..1eb7792 100644
--- a/src/world/importance_map.rs
+++ b/src/world/importance_map.rs
@@ -15,7 +15,6 @@ use crate::prelude::*;
 
 #[cfg(feature = "preview")]
 use minifb::{Scale, Window, WindowOptions};
-use pbr::ProgressBar;
 
 use rayon::iter::ParallelIterator;
 
@@ -588,8 +587,8 @@ mod test {
                     estimate2 +=
                         y_bar(sw.lambda * 10.0) * sw.energy / pdf_solid_angle_1 / wavelength_pdf;
                     let (px, py) = (
-                        (uv.0 * width as f32) as usize,
-                        (uv.1 * height as f32) as usize,
+                        (uv.0 * width as f32).clamp(0.0, (width - 1) as f32) as usize,
+                        (uv.1 * height as f32).clamp(0.0, (height - 1) as f32) as usize,
                     );
 
                     // film.buffer[px + width * py] += XYZColor::from(sw) / (pdf.0 + 0.01) / wavelength_pdf;
@@ -698,8 +697,8 @@ mod test {
                 // sum += y_bar(sw.lambda * 10.0) * sw.energy;
                 estimate += y_bar(sw.lambda * 10.0) * sw.energy / wavelength_pdf;
                 let (px, py) = (
-                    (uv.0 * width as f32) as usize,
-                    (uv.1 * height as f32) as usize,
+                    (uv.0 * width as f32).clamp(0.0, (width - 1) as f32) as usize,
+                    (uv.1 * height as f32).clamp(0.0, (height - 1) as f32) as usize,
                 );
                 film.buffer[px + width * py] += XYZColor::from(sw) / wavelength_pdf / (*pdf + 0.01);
             }