All final intersections are now done in world space.
BVH traversal still happens in local space, but final actual surface intersection calculations are done in world space by transforming the triangle into world space. This is to improve numerical consistency between intersections.
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@ -6,7 +6,7 @@ use std::iter::Iterator;
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use math::{Point, Matrix4x4};
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use lerp::{lerp, lerp_slice, Lerp};
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use ray::Ray;
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use ray::AccelRay;
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const BBOX_MAXT_ADJUST: f32 = 1.00000024;
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@ -38,7 +38,7 @@ impl BBox {
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}
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// Returns whether the given ray intersects with the bbox.
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pub fn intersect_ray(&self, ray: &Ray) -> bool {
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pub fn intersect_accel_ray(&self, ray: &AccelRay) -> bool {
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// Calculate slab intersections
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let t1 = (self.min.co - ray.orig.co) * ray.dir_inv.co;
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let t2 = (self.max.co - ray.orig.co) * ray.dir_inv.co;
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12
src/bvh.rs
12
src/bvh.rs
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@ -3,7 +3,7 @@
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use lerp::lerp_slice;
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use bbox::BBox;
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use boundable::Boundable;
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use ray::Ray;
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use ray::{Ray, AccelRay};
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use algorithm::partition;
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#[derive(Debug)]
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@ -177,8 +177,8 @@ impl BVH {
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}
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pub fn traverse<T, F>(&self, rays: &mut [Ray], objects: &[T], mut obj_ray_test: F)
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where F: FnMut(&T, &mut [Ray])
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pub fn traverse<T, F>(&self, rays: &mut [AccelRay], objects: &[T], mut obj_ray_test: F)
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where F: FnMut(&T, &mut [AccelRay])
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{
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if self.nodes.len() == 0 {
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return;
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@ -192,14 +192,14 @@ impl BVH {
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match self.nodes[i_stack[stack_ptr]] {
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BVHNode::Internal { bounds_range: br, second_child_index, split_axis } => {
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let part = partition(&mut rays[..ray_i_stack[stack_ptr]], |r| {
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lerp_slice(&self.bounds[br.0..br.1], r.time).intersect_ray(r)
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lerp_slice(&self.bounds[br.0..br.1], r.time).intersect_accel_ray(r)
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});
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if part > 0 {
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i_stack[stack_ptr] += 1;
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i_stack[stack_ptr + 1] = second_child_index;
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ray_i_stack[stack_ptr] = part;
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ray_i_stack[stack_ptr + 1] = part;
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if rays[0].dir[split_axis as usize].is_sign_positive() {
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if rays[0].dir_inv[split_axis as usize].is_sign_positive() {
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i_stack.swap(stack_ptr, stack_ptr + 1);
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}
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stack_ptr += 1;
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@ -210,7 +210,7 @@ impl BVH {
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BVHNode::Leaf { bounds_range: br, object_range } => {
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let part = partition(&mut rays[..ray_i_stack[stack_ptr]], |r| {
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lerp_slice(&self.bounds[br.0..br.1], r.time).intersect_ray(r)
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lerp_slice(&self.bounds[br.0..br.1], r.time).intersect_accel_ray(r)
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});
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if part > 0 {
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for obj in &objects[object_range.0..object_range.1] {
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@ -33,7 +33,7 @@ use std::fs::File;
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use docopt::Docopt;
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use ray::Ray;
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use ray::{Ray, AccelRay};
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use parse::{parse_scene, DataTree};
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// ----------------------------------------------------------------
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@ -92,6 +92,7 @@ fn main() {
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};
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println!("Ray size: {} bytes", mem::size_of::<Ray>());
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println!("AccelRay size: {} bytes", mem::size_of::<AccelRay>());
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// Iterate through scenes and render them
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if let DataTree::Internal { ref children, .. } = dt {
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35
src/ray.rs
35
src/ray.rs
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@ -9,10 +9,8 @@ use math::{Vector, Point, Matrix4x4};
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pub struct Ray {
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pub orig: Point,
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pub dir: Vector,
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pub dir_inv: Vector,
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pub max_t: f32,
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pub time: f32,
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pub id: u32,
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pub flags: u32,
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}
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@ -21,10 +19,8 @@ impl Ray {
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Ray {
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orig: orig,
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dir: dir,
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dir_inv: Vector { co: Float4::new(1.0, 1.0, 1.0, 1.0) / dir.co },
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max_t: std::f32::INFINITY,
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time: time,
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id: 0,
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flags: 0,
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}
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}
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@ -32,16 +28,39 @@ impl Ray {
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pub fn transform(&mut self, mat: &Matrix4x4) {
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self.orig = self.orig * *mat;
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self.dir = self.dir * *mat;
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self.dir_inv = Vector { co: Float4::new(1.0, 1.0, 1.0, 1.0) / self.dir.co };
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}
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}
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#[derive(Debug, Copy, Clone)]
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pub struct AccelRay {
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pub orig: Point,
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pub dir_inv: Vector,
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pub max_t: f32,
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pub time: f32,
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pub flags: u32,
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pub id: u32,
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}
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impl AccelRay {
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pub fn new(ray: &Ray, id: u32) -> AccelRay {
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AccelRay {
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orig: ray.orig,
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dir_inv: Vector { co: Float4::new(1.0, 1.0, 1.0, 1.0) / ray.dir.co },
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max_t: ray.max_t,
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time: ray.time,
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flags: ray.flags,
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id: id,
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}
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}
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pub fn update_from_world_ray(&mut self, wr: &Ray) {
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self.orig = wr.orig;
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self.dir = wr.dir;
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self.dir_inv = Vector { co: Float4::new(1.0, 1.0, 1.0, 1.0) / wr.dir.co };
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}
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pub fn update_from_xformed_world_ray(&mut self, wr: &Ray, mat: &Matrix4x4) {
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self.update_from_world_ray(wr);
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self.transform(mat);
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self.orig = wr.orig * *mat;
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self.dir_inv = Vector { co: Float4::new(1.0, 1.0, 1.0, 1.0) / (wr.dir * *mat).co };
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}
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}
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@ -102,7 +102,6 @@ impl Renderer {
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halton::sample(1, offset + si as u32),
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halton::sample(2, offset + si as u32))
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};
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ray.id = rays.len() as u32;
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rays.push(ray);
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pixel_mapping.push((x, y))
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}
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@ -120,7 +119,7 @@ impl Renderer {
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if let &surface::SurfaceIntersection::Hit { t: _,
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pos: _,
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nor: _,
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space: _,
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local_space: _,
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uv } = isect {
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col.0 += uv.0 / self.spp as f32;
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@ -4,7 +4,7 @@ use std::fmt::Debug;
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pub mod triangle_mesh;
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use ray::Ray;
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use ray::{Ray, AccelRay};
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use math::{Point, Normal, Matrix4x4};
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use boundable::Boundable;
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@ -17,11 +17,15 @@ pub enum SurfaceIntersection {
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t: f32,
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pos: Point,
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nor: Normal,
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space: Matrix4x4,
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local_space: Matrix4x4,
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uv: (f32, f32),
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},
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}
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pub trait Surface: Boundable + Debug + Sync {
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fn intersect_rays(&self, rays: &mut [Ray], isects: &mut [SurfaceIntersection]);
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fn intersect_rays(&self,
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accel_rays: &mut [AccelRay],
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wrays: &[Ray],
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isects: &mut [SurfaceIntersection],
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space: &[Matrix4x4]);
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}
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@ -1,8 +1,8 @@
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#![allow(dead_code)]
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use lerp::{lerp, lerp_slice_with};
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use lerp::{lerp, lerp_slice, lerp_slice_with};
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use math::{Point, Normal, Matrix4x4};
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use ray::Ray;
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use ray::{Ray, AccelRay};
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use triangle;
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use bbox::BBox;
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use boundable::Boundable;
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@ -59,22 +59,30 @@ impl Boundable for TriangleMesh {
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impl Surface for TriangleMesh {
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fn intersect_rays(&self, rays: &mut [Ray], isects: &mut [SurfaceIntersection]) {
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self.accel.traverse(&mut rays[..], &self.indices, |tri_i, rs| {
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fn intersect_rays(&self,
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accel_rays: &mut [AccelRay],
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wrays: &[Ray],
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isects: &mut [SurfaceIntersection],
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space: &[Matrix4x4]) {
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self.accel.traverse(&mut accel_rays[..], &self.indices, |tri_i, rs| {
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for r in rs {
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let wr = &wrays[r.id as usize];
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let tri =
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lerp_slice_with(&self.geo[*tri_i..(*tri_i + self.time_samples)],
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r.time,
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wr.time,
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|a, b, t| {
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(lerp(a.0, b.0, t), lerp(a.1, b.1, t), lerp(a.2, b.2, t))
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});
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if let Some((t, tri_u, tri_v)) = triangle::intersect_ray(r, tri) {
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let mat_space = lerp_slice(space, wr.time);
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let mat_inv = mat_space.inverse();
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let tri = (tri.0 * mat_inv, tri.1 * mat_inv, tri.2 * mat_inv);
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if let Some((t, tri_u, tri_v)) = triangle::intersect_ray(wr, tri) {
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if t < r.max_t {
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isects[r.id as usize] = SurfaceIntersection::Hit {
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t: t,
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pos: r.orig + (r.dir * t),
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pos: wr.orig + (wr.dir * t),
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nor: Normal::new(0.0, 0.0, 0.0), // TODO
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space: Matrix4x4::new(), // TODO
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local_space: mat_space,
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uv: (tri_u, tri_v),
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};
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r.max_t = t;
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@ -4,12 +4,12 @@ use std::cell::UnsafeCell;
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use math::{Matrix4x4, multiply_matrix_slices};
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use lerp::lerp_slice;
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use assembly::{Assembly, Object, InstanceType};
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use ray::Ray;
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use ray::{Ray, AccelRay};
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use surface::SurfaceIntersection;
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pub struct Tracer<'a> {
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root: &'a Assembly,
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rays: UnsafeCell<Vec<Ray>>, // Should only be used from trace(), not any other methods
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rays: UnsafeCell<Vec<AccelRay>>, // Should only be used from trace(), not any other methods
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xform_stack: TransformStack,
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isects: Vec<SurfaceIntersection>,
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}
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@ -30,7 +30,8 @@ impl<'a> Tracer<'a> {
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unsafe {
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(*rays_ptr).clear();
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(*rays_ptr).reserve(wrays.len());
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(*rays_ptr).extend(wrays.iter());
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let mut ids = 0..(wrays.len() as u32);
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(*rays_ptr).extend(wrays.iter().map(|wr| AccelRay::new(wr, ids.next().unwrap())));
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}
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// Ready the isects
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@ -55,8 +56,11 @@ impl<'a> Tracer<'a> {
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return &self.isects;
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}
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fn trace_assembly<'b>(&'b mut self, assembly: &Assembly, wrays: &[Ray], rays: &mut [Ray]) {
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assembly.object_accel.traverse(&mut rays[..], &assembly.instances[..], |inst, rs| {
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fn trace_assembly<'b>(&'b mut self,
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assembly: &Assembly,
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wrays: &[Ray],
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accel_rays: &mut [AccelRay]) {
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assembly.object_accel.traverse(&mut accel_rays[..], &assembly.instances[..], |inst, rs| {
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// Transform rays if needed
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if let Some((xstart, xend)) = inst.transform_indices {
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// Push transforms to stack
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@ -106,10 +110,10 @@ impl<'a> Tracer<'a> {
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});
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}
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fn trace_object<'b>(&'b mut self, obj: &Object, wrays: &[Ray], rays: &mut [Ray]) {
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fn trace_object<'b>(&'b mut self, obj: &Object, wrays: &[Ray], rays: &mut [AccelRay]) {
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match obj {
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&Object::Surface(ref surface) => {
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surface.intersect_rays(rays, &mut self.isects);
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surface.intersect_rays(rays, wrays, &mut self.isects, self.xform_stack.top());
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}
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}
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}
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