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Eevee: Refraction: Add "thickness" parameter.

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This enables to fake a second refraction event. This is great to simulate thin planar objects such as glass panels.
This commit is contained in:
Clément Foucault
2017-08-10 15:43:15 +02:00
parent 896154d15d
commit 6e2f17ea02
6 changed files with 68 additions and 43 deletions
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57
source/blender/draw/engines/eevee/shaders/lit_surface_frag.glsl
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@@ -7,9 +7,7 @@ uniform int planar_count;
uniform bool specToggle;
uniform bool ssrToggle;
#ifdef USE_REFRACTION
uniform float refractionThickness;
#endif
uniform float refractionDepth;
#ifndef UTIL_TEX
#define UTIL_TEX
@@ -551,7 +549,7 @@ vec3 eevee_surface_glossy_lit(vec3 N, vec3 f0, float roughness, float ao, int ss
/* ----------- Transmission ----------- */
vec3 eevee_surface_refraction(vec3 N, vec3 f0, float roughness, float ior, int ssr_id, out vec3 ssr_spec)
vec3 eevee_surface_refraction(vec3 N, vec3 f0, float roughness, float ior)
{
/* Zero length vectors cause issues, see: T51979. */
#if 0
@@ -581,16 +579,26 @@ vec3 eevee_surface_refraction(vec3 N, vec3 f0, float roughness, float ior, int s
/* Accumulate light from all sources until accumulator is full. Then apply Occlusion and BRDF. */
vec4 trans_accum = vec4(0.0);
/* Refract the view vector using the depth heuristic.
* Then later Refract a second time the already refracted
* ray using the inverse ior. */
float final_ior = (refractionDepth > 0.0) ? 1.0 / ior : ior;
vec3 refr_V = (refractionDepth > 0.0) ? -refract(-V, N, final_ior) : V;
vec3 refr_pos = (refractionDepth > 0.0) ? line_plane_intersect(worldPosition, refr_V, worldPosition - N * refractionDepth, N) : worldPosition;
#ifdef USE_REFRACTION
/* Screen Space Refraction */
if (ssrToggle && roughness < maxRoughness + 0.2) {
vec3 rand = texture(utilTex, vec3(gl_FragCoord.xy / LUT_SIZE, 2.0)).xzw;
/* Find approximated position of the 2nd refraction event. */
vec3 refr_vpos = (refractionDepth > 0.0) ? transform_point(ViewMatrix, refr_pos) : viewPosition;
float ray_ofs = 1.0 / float(rayCount);
vec4 spec = screen_space_refraction(viewPosition, N, V, ior, roughnessSquared, rand, 0.0);
if (rayCount > 1) spec += screen_space_refraction(viewPosition, N, V, ior, roughnessSquared, rand.xyz * vec3(1.0, -1.0, -1.0), 1.0 * ray_ofs);
if (rayCount > 2) spec += screen_space_refraction(viewPosition, N, V, ior, roughnessSquared, rand.xzy * vec3(1.0, 1.0, -1.0), 2.0 * ray_ofs);
if (rayCount > 3) spec += screen_space_refraction(viewPosition, N, V, ior, roughnessSquared, rand.xzy * vec3(1.0, -1.0, 1.0), 3.0 * ray_ofs);
vec4 spec = screen_space_refraction(refr_vpos, N, refr_V, final_ior, roughnessSquared, rand, 0.0);
if (rayCount > 1) spec += screen_space_refraction(refr_vpos, N, refr_V, final_ior, roughnessSquared, rand.xyz * vec3(1.0, -1.0, -1.0), 1.0 * ray_ofs);
if (rayCount > 2) spec += screen_space_refraction(refr_vpos, N, refr_V, final_ior, roughnessSquared, rand.xzy * vec3(1.0, 1.0, -1.0), 2.0 * ray_ofs);
if (rayCount > 3) spec += screen_space_refraction(refr_vpos, N, refr_V, final_ior, roughnessSquared, rand.xzy * vec3(1.0, -1.0, 1.0), 3.0 * ray_ofs);
spec /= float(rayCount);
spec.a *= smoothstep(maxRoughness + 0.2, maxRoughness, roughness);
accumulate_light(spec.rgb, spec.a, trans_accum);
@@ -599,7 +607,7 @@ vec3 eevee_surface_refraction(vec3 N, vec3 f0, float roughness, float ior, int s
/* Specular probes */
/* NOTE: This bias the IOR */
vec3 spec_dir = get_specular_refraction_dominant_dir(N, V, roughness, ior);
vec3 refr_dir = get_specular_refraction_dominant_dir(N, refr_V, roughness, final_ior);
/* Starts at 1 because 0 is world probe */
for (int i = 1; i < MAX_PROBE && i < probe_count && trans_accum.a < 0.999; ++i) {
@@ -608,14 +616,14 @@ vec3 eevee_surface_refraction(vec3 N, vec3 f0, float roughness, float ior, int s
float fade = probe_attenuation_cube(cd, worldPosition);
if (fade > 0.0) {
vec3 spec = probe_evaluate_cube(float(i), cd, worldPosition, spec_dir, roughnessSquared);
vec3 spec = probe_evaluate_cube(float(i), cd, refr_pos, refr_dir, roughnessSquared);
accumulate_light(spec, fade, trans_accum);
}
}
/* World Specular */
if (trans_accum.a < 0.999) {
vec3 spec = probe_evaluate_world_spec(spec_dir, roughnessSquared);
vec3 spec = probe_evaluate_world_spec(refr_dir, roughnessSquared);
accumulate_light(spec, 1.0, trans_accum);
}
@@ -701,9 +709,13 @@ vec3 eevee_surface_glass(vec3 N, vec3 transmission_col, float roughness, float i
}
}
/* Specular probes */
vec3 spec_dir = get_specular_reflection_dominant_dir(N, V, roughnessSquared);
vec3 refr_dir = get_specular_refraction_dominant_dir(N, V, roughness, ior);
/* Refract the view vector using the depth heuristic.
* Then later Refract a second time the already refracted
* ray using the inverse ior. */
float final_ior = (refractionDepth > 0.0) ? 1.0 / ior : ior;
vec3 refr_V = (refractionDepth > 0.0) ? -refract(-V, N, final_ior) : V;
vec3 refr_pos = (refractionDepth > 0.0) ? line_plane_intersect(worldPosition, refr_V, worldPosition - N * refractionDepth, N) : worldPosition;
vec4 trans_accum = vec4(0.0);
#ifdef USE_REFRACTION
@@ -711,17 +723,24 @@ vec3 eevee_surface_glass(vec3 N, vec3 transmission_col, float roughness, float i
if (ssrToggle && roughness < maxRoughness + 0.2) {
vec3 rand = texture(utilTex, vec3(gl_FragCoord.xy / LUT_SIZE, 2.0)).xzw;
/* Find approximated position of the 2nd refraction event. */
vec3 refr_vpos = (refractionDepth > 0.0) ? transform_point(ViewMatrix, refr_pos) : viewPosition;
float ray_ofs = 1.0 / float(rayCount);
vec4 spec = screen_space_refraction(viewPosition, N, V, ior, roughnessSquared, rand, 0.0);
if (rayCount > 1) spec += screen_space_refraction(viewPosition, N, V, ior, roughnessSquared, rand.xyz * vec3(1.0, -1.0, -1.0), 1.0 * ray_ofs);
if (rayCount > 2) spec += screen_space_refraction(viewPosition, N, V, ior, roughnessSquared, rand.xzy * vec3(1.0, 1.0, -1.0), 2.0 * ray_ofs);
if (rayCount > 3) spec += screen_space_refraction(viewPosition, N, V, ior, roughnessSquared, rand.xzy * vec3(1.0, -1.0, 1.0), 3.0 * ray_ofs);
vec4 spec = screen_space_refraction(refr_vpos, N, refr_V, final_ior, roughnessSquared, rand, 0.0);
if (rayCount > 1) spec += screen_space_refraction(refr_vpos, N, refr_V, final_ior, roughnessSquared, rand.xyz * vec3(1.0, -1.0, -1.0), 1.0 * ray_ofs);
if (rayCount > 2) spec += screen_space_refraction(refr_vpos, N, refr_V, final_ior, roughnessSquared, rand.xzy * vec3(1.0, 1.0, -1.0), 2.0 * ray_ofs);
if (rayCount > 3) spec += screen_space_refraction(refr_vpos, N, refr_V, final_ior, roughnessSquared, rand.xzy * vec3(1.0, -1.0, 1.0), 3.0 * ray_ofs);
spec /= float(rayCount);
spec.a *= smoothstep(maxRoughness + 0.2, maxRoughness, roughness);
accumulate_light(spec.rgb, spec.a, trans_accum);
}
#endif
/* Specular probes */
vec3 refr_dir = get_specular_refraction_dominant_dir(N, refr_V, roughness, final_ior);
vec3 spec_dir = get_specular_reflection_dominant_dir(N, V, roughnessSquared);
/* Starts at 1 because 0 is world probe */
for (int i = 1; i < MAX_PROBE && i < probe_count && spec_accum.a < 0.999 && trans_accum.a < 0.999; ++i) {
CubeData cd = probes_data[i];
@@ -733,7 +752,7 @@ vec3 eevee_surface_glass(vec3 N, vec3 transmission_col, float roughness, float i
vec3 spec = probe_evaluate_cube(float(i), cd, worldPosition, spec_dir, roughness);
accumulate_light(spec, fade, spec_accum);
spec = probe_evaluate_cube(float(i), cd, worldPosition, refr_dir, roughnessSquared);
spec = probe_evaluate_cube(float(i), cd, refr_pos, refr_dir, roughnessSquared);
accumulate_light(spec, fade, trans_accum);
}
}