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EEVEE-Next: Volume: Add artificial backface hit to close volumes

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This could happen for non manifold meshes (like a water plane)
when using the accurate method.

If last hit in the volume ray is a frontface, we now consider
everything behind it in volume.
This commit is contained in:
Clément Foucault 2024-06-13 16:38:41 +02:00
parent 2d4c624a87
commit b0eb156344
1 changed files with 5 additions and 2 deletions
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7
source/blender/draw/engines/eevee_next/shaders/eevee_occupancy_convert_frag.glsl
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@ -16,7 +16,7 @@ bool is_front_face_hit(float stored_hit_depth)
void main()
{
float hit_depths[VOLUME_HIT_DEPTH_MAX];
float hit_ordered[VOLUME_HIT_DEPTH_MAX];
float hit_ordered[VOLUME_HIT_DEPTH_MAX + 1];
int hit_index[VOLUME_HIT_DEPTH_MAX];
ivec2 texel = ivec2(gl_FragCoord.xy);
@ -57,9 +57,12 @@ void main()
/* True if last interface was a volume entry. */
/* Initialized to front facing if first hit is a backface to support camera inside the volume. */
bool last_frontfacing = !is_front_face_hit(hit_ordered[0]);
/* Add artificial backfacing hit to close volumes we entered but never exited.
* Fixes issues with non-manifold meshes or things like water planes. */
hit_ordered[hit_count] = -1.0;
/* Bit index of the last interface. */
int last_bit = 0;
for (int i = 0; i < hit_count; i++) {
for (int i = 0; i <= hit_count; i++) {
bool frontfacing = is_front_face_hit(hit_ordered[i]);
if (last_frontfacing == frontfacing) {
/* Same facing, do not treat as a volume interface. */