Fixing logic bugs in Sampling, texture loading. Moving on to issues with ImageTexture, the long dreaded dive

.gitignore

@@ -18,3 +18,4 @@ output/
 *.md
 !README.md
 !INSTALL.md
+docs/

shared/src/core/image.rs

@@ -7,6 +7,7 @@ use core::hash;
 use core::ops::{Deref, DerefMut};
 use num_traits::Float as NumFloat;
 
+#[repr(C)]
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum WrapMode {
     Black,
@@ -225,6 +226,7 @@ pub struct ImageBase {
     pub n_channels: i32,
 }
 
+#[repr(C)]
 #[derive(Clone, Debug)]
 pub struct Image {
     pub format: PixelFormat,

shared/src/core/medium.rs

@@ -727,33 +727,13 @@ impl Default for MediumInterface {
     }
 }
 
-impl From<Medium> for MediumInterface {
-    fn from(p: Ptr<Medium>) -> Self {
-        Self {
-            inside: p,
-            outside: p,
-        }
-    }
-}
-
-// impl From<&Medium> for MediumInterface {
-//     fn from(medium: &Medium) -> Self {
-//         Self::from(medium.clone())
-//     }
-// }
-//
 impl MediumInterface {
-    pub fn new(inside: &Medium, outside: &Medium) -> Self {
-        Self {
-            inside: Ptr::from(inside),
-            outside: Ptr::from(outside),
-        }
+    pub fn new(inside: Ptr<Medium>, outside: Ptr<Medium>) -> Self {
+        Self { inside, outside }
     }
-
     pub fn empty() -> Self {
         Self::default()
     }
-
     pub fn is_medium_transition(&self) -> bool {
         self.inside != self.outside
     }

shared/src/core/sampler.rs

@@ -5,8 +5,7 @@ use crate::utils::math::{
     clamp, encode_morton_2, inverse_radical_inverse, lerp, log2_int,
     owen_scrambled_radical_inverse, permutation_element, radical_inverse, round_up_pow2,
     scrambled_radical_inverse, sobol_interval_to_index, sobol_sample, BinaryPermuteScrambler,
-    DigitPermutation, FastOwenScrambler, NoRandomizer, OwenScrambler, Scrambler,
-    PRIME_TABLE_SIZE,
+    DigitPermutation, FastOwenScrambler, NoRandomizer, OwenScrambler, Scrambler, PRIME_TABLE_SIZE,
 };
 use crate::utils::rng::Rng;
 use crate::utils::sobol::N_SOBOL_DIMENSIONS;
@@ -193,9 +192,10 @@ impl SamplerTrait for HaltonSampler {
     }
 
     fn get1d(&mut self) -> Float {
-        if self.dim >= PRIME_TABLE_SIZE as u32 {
+        if self.dim + 1 >= PRIME_TABLE_SIZE as u32 {
             self.dim = 2;
         }
+        self.dim += 1;
         self.sample_dimension(self.dim)
     }
 
@@ -211,7 +211,7 @@ impl SamplerTrait for HaltonSampler {
     fn get_pixel2d(&mut self) -> Point2f {
         Point2f::new(
             radical_inverse(0, self.halton_index >> self.base_exponents[0]),
-            radical_inverse(1, self.halton_index >> self.base_exponents[1]),
+            radical_inverse(1, self.halton_index / self.base_scales[1]),
         )
     }
 }

shared/src/shapes/disk.rs

@@ -111,7 +111,7 @@ impl DiskShape {
         let p_error = Vector3f::zero();
         let flip_normal = self.reverse_orientation ^ self.transform_swap_handedness;
         let wo_object = self.object_from_render.apply_to_vector(wo);
-        SurfaceInteraction::new(
+        let intr = SurfaceInteraction::new(
             Point3fi::new_with_error(p_hit, p_error),
             Point2f::new(u, v),
             wo_object,
@@ -121,7 +121,15 @@ impl DiskShape {
             dndv,
             time,
             flip_normal,
-        )
+        );
+
+        match self
+            .render_from_object
+            .apply_to_interaction(&Interaction::Surface(intr))
+        {
+            Interaction::Surface(si) => si,
+            _ => unreachable!("Only surfaces need apply"),
+        }
     }
 }
 
@@ -203,7 +211,7 @@ impl ShapeTrait for DiskShape {
         }
         wi = wi.normalize();
 
-        ss.pdf = Vector3f::from(ss.intr.n()).dot(-wi).abs() / ctx.p().distance_squared(ss.intr.p());
+        ss.pdf /= Vector3f::from(ss.intr.n()).abs_dot(-wi) / ctx.p().distance_squared(ss.intr.p());
         if ss.pdf.is_infinite() {
             return None;
         }

shared/src/shapes/triangle.rs

@@ -81,7 +81,7 @@ impl TriangleShape {
 
     fn get_uvs(&self) -> Option<[Point2f; 3]> {
         let mesh = self.mesh();
-        if mesh.s.is_empty() {
+        if mesh.uv.is_empty() {
             return None;
         }
         let [v0, v1, v2] = self.get_vertex_indices();

shared/src/textures/image.rs

@@ -1,5 +1,5 @@
-use crate::Float;
 use crate::core::color::{RGB, XYZ};
+use crate::core::image::Image;
 use crate::core::spectrum::SpectrumTrait;
 use crate::core::texture::{SpectrumType, TextureEvalContext, TextureMapping2D};
 use crate::spectra::{
@@ -7,6 +7,7 @@ use crate::spectra::{
     SampledWavelengths,
 };
 use crate::utils::Ptr;
+use crate::Float;
 
 /* GPU heavy code, dont know if this will ever work the way Im doing things.
 * Leaving it here isolated, for careful handling */
@@ -15,6 +16,7 @@ use crate::utils::Ptr;
 pub struct GPUSpectrumImageTexture {
     pub mapping: TextureMapping2D,
     pub tex_obj: u64,
+    pub image: Ptr<Image>,
     pub scale: Float,
     pub invert: bool,
     pub is_single_channel: bool,

src/wavefront/integrator.rs

@@ -374,6 +374,9 @@ impl CpuWavefrontRenderer {
         } else {
             &self.basic_eval_material_queue
         };
+        if self.regularize {
+            eprintln!("regularize=true");
+        }
 
         let n = queue.size();
         let next = ((depth + 1) % 2) as usize;
@@ -451,8 +454,14 @@ impl CpuWavefrontRenderer {
                     eta_scale *= square(bs.eta);
                 }
 
+                if material.is_conductor() {
+                    if bs.is_specular() {
+                        eprintln!("NON SPECULAR");
+                    }
+                }
+
                 let rr_beta = (beta * eta_scale / r_u.average()).max_component_value();
-                if rr_beta < 1.0 && w.depth > 1 {
+                if rr_beta < 1.0 && w.depth >= 1 {
                     let q = (1.0 - rr_beta).max(0.0_f32);
                     if rs.indirect.rr < q {
                         beta = SampledSpectrum::new(0.0);