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Eevee: SSR: Don't block the ray if tracing behind object.

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This requires to check for backface after a hit.
This commit is contained in:
Clément Foucault
2017-07-19 23:40:14 +02:00
parent 72a4778391
commit babef873fc
2 changed files with 14 additions and 12 deletions
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9
source/blender/draw/engines/eevee/shaders/effect_ssr_frag.glsl
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@@ -67,11 +67,14 @@ void main()
/* Raycast over screen */
float hit_dist = raycast(depthBuffer, viewPosition, R);
/* TODO Check if has hit a backface */
vec2 hit_co = project_point(ProjectionMatrix, viewPosition + R * hit_dist).xy * 0.5 + 0.5;
/* Check if has hit a backface */
vec3 hit_N = normal_decode(textureLod(normalBuffer, hit_co, 0.0).rg, V);
pdf *= step(0.0, dot(-R, hit_N));
hitData = hit_co.xyxy;
pdfData = vec4(pdf) * step(-0.1, hit_dist);
pdfData = vec4(pdf) * step(0.0, hit_dist);
}
#else /* STEP_RESOLVE */

17
source/blender/draw/engines/eevee/shaders/raytrace_lib.glsl
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@@ -111,7 +111,10 @@ float raycast(sampler2D depth_texture, vec3 ray_origin, vec3 ray_dir)
raw_depth = texelFetch(depth_texture, ivec2(hitpixel), 0).r;
view_depth = get_view_z_from_depth(raw_depth);
if (zmax < view_depth) {
/* TODO user threshold */
const float threshold = 0.5; /* In view space */
/* Check if we are somewhere near the surface. */
if ((zmax < view_depth) && (zmax > view_depth - threshold)) {
/* Below surface, cannot trace further */
hit = true;
}
@@ -137,20 +140,16 @@ float raycast(sampler2D depth_texture, vec3 ray_origin, vec3 ray_dir)
raw_depth = texelFetch(depth_texture, ivec2(hitpixel), 0).r;
view_depth = get_view_z_from_depth(raw_depth);
if (zmax < view_depth) {
/* TODO user threshold */
const float threshold = 0.5; /* In view space */
/* Check if we are somewhere near the surface. */
if ((zmax < view_depth) && (zmax > view_depth - threshold)) {
/* Below surface, cannot trace further */
break;
}
}
}
/* Check if we are somewhere near the surface. */
/* TODO user threshold */
float threshold = 0.1; /* In clip space */
if (zmax < view_depth - threshold) {
hit = false;
}
/* Check failure cases (out of screen, hit background) */
if (hit && (raw_depth != 1.0) && (raw_depth != 0.0)) {
/* Return length */