102 lines
2.8 KiB
Rust
102 lines
2.8 KiB
Rust
use crate::core::geometry::{
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Bounds3f, Normal3f, Point2f, Point3f, Point3fi, Ray, Vector3f, VectorLike,
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};
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use crate::core::interaction::{Interaction, InteractionBase, SimpleInteraction};
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use crate::core::light::{LightBase, LightBounds, LightLiSample, LightSampleContext, LightTrait};
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use crate::core::spectrum::SpectrumTrait;
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use crate::spectra::{DenselySampledSpectrum, SampledSpectrum, SampledWavelengths};
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use crate::utils::Ptr;
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use crate::{Float, PI};
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use num_traits::Float as NumFloat;
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#[repr(C)]
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#[derive(Clone, Copy, Debug)]
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pub struct DistantLight {
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pub base: LightBase,
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pub lemit: Ptr<DenselySampledSpectrum>,
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pub scale: Float,
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pub scene_center: Point3f,
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pub scene_radius: Float,
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}
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impl DistantLight {
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pub fn sample_li_base(
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&self,
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ctx_p: Point3f,
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lambda: &SampledWavelengths,
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) -> (SampledSpectrum, Vector3f, Float, Point3f) {
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let wi = self
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.base
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.render_from_light
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.apply_to_vector(Vector3f::new(0., 0., 1.))
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.normalize();
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let p_outside = ctx_p + wi * 2. * self.scene_radius;
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let li = self.scale * self.lemit.sample(lambda);
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(li, wi, 1.0, p_outside)
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}
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}
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impl LightTrait for DistantLight {
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fn base(&self) -> &LightBase {
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&self.base
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}
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fn phi(&self, lambda: SampledWavelengths) -> SampledSpectrum {
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self.scale * self.lemit.sample(&lambda) * PI * self.scene_radius.sqrt()
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}
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fn sample_li(
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&self,
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ctx: &LightSampleContext,
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_u: Point2f,
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lambda: &SampledWavelengths,
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_allow_incomplete_pdf: bool,
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) -> Option<LightLiSample> {
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let wi = self
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.base
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.render_from_light
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.apply_to_vector(Vector3f::new(0., 0., 1.))
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.normalize();
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let p_outside = ctx.p() + wi * 2. * self.scene_radius;
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let li = self.scale * self.lemit.sample(lambda);
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let base = InteractionBase::new_boundary(p_outside, 0.0, self.base.medium_interface);
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let intr = SimpleInteraction::new(base);
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Some(LightLiSample::new(li, wi, 1., Interaction::Simple(intr)))
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}
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fn pdf_li(
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&self,
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_ctx: &LightSampleContext,
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_wi: Vector3f,
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_allow_incomplete_pdf: bool,
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) -> Float {
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0.
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}
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fn l(
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&self,
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_p: Point3f,
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_n: Normal3f,
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_uv: Point2f,
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_w: Vector3f,
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_lambda: &SampledWavelengths,
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) -> SampledSpectrum {
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todo!()
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}
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fn le(&self, _ray: &Ray, _lambda: &SampledWavelengths) -> SampledSpectrum {
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todo!()
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}
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fn preprocess(&mut self, scene_bounds: &Bounds3f) {
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let (center, radius) = scene_bounds.bounding_sphere();
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self.scene_center = center;
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self.scene_radius = radius;
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}
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fn bounds(&self) -> Option<LightBounds> {
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None
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}
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}
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