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Fix BaseMaterial3D refracting objects located in front of the material

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Depth comparison is now used to prevent refraction from occurring
if the pixel being refracted is located in front of the object.

For pixels slightly behind the object, a `smoothstep()` curve
is used to progressively increases refraction intensity
as the distance between the object and the refraction increases.
This avoids sudden discontinuities in the refraction.

Co-authored-by: GeneralLegendary <generallegendary456@gmail.com>
This commit is contained in:
Hugo Locurcio 2024-06-22 03:10:30 +02:00
parent a0d1ba4a3d
commit 8a485ff658
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GPG key ID: 39E8F8BE30B0A49C
1 changed files with 13 additions and 6 deletions
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19
scene/resources/material.cpp
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@ -946,7 +946,7 @@ uniform vec4 refraction_texture_channel;
code += "uniform sampler2D screen_texture : hint_screen_texture, repeat_disable, filter_linear_mipmap;\n";
}
if (proximity_fade_enabled) {
if (features[FEATURE_REFRACTION] || proximity_fade_enabled) {
code += "uniform sampler2D depth_texture : hint_depth_texture, repeat_disable, filter_nearest;\n";
}
@ -1627,7 +1627,14 @@ void fragment() {)";
}
code += R"(
float ref_amount = 1.0 - albedo.a * albedo_tex.a;
EMISSION += textureLod(screen_texture, ref_ofs, ROUGHNESS * 8.0).rgb * ref_amount * EXPOSURE;
float refraction_depth_tex = textureLod(depth_texture, ref_ofs, 0.0).r;
vec4 refraction_view_pos = INV_PROJECTION_MATRIX * vec4(SCREEN_UV * 2.0 - 1.0, refraction_depth_tex, 1.0);
refraction_view_pos.xyz /= refraction_view_pos.w;
// If the depth buffer is lower then the model's Z position, use the refracted UV, otherwise use the normal screen UV.
// At low depth differences, decrease refraction intensity to avoid sudden discontinuities.
EMISSION += textureLod(screen_texture, mix(SCREEN_UV, ref_ofs, smoothstep(0.0, 1.0, VERTEX.z - refraction_view_pos.z)), ROUGHNESS * 8.0).rgb * ref_amount * EXPOSURE;
ALBEDO *= 1.0 - ref_amount;
// Force transparency on the material (required for refraction).
ALPHA = 1.0;
@ -1649,10 +1656,10 @@ void fragment() {)";
if (proximity_fade_enabled) {
code += R"(
// Proximity Fade: Enabled
float depth_tex = textureLod(depth_texture, SCREEN_UV, 0.0).r;
vec4 world_pos = INV_PROJECTION_MATRIX * vec4(SCREEN_UV * 2.0 - 1.0, depth_tex, 1.0);
world_pos.xyz /= world_pos.w;
ALPHA *= clamp(1.0 - smoothstep(world_pos.z + proximity_fade_distance, world_pos.z, VERTEX.z), 0.0, 1.0);
float proximity_depth_tex = textureLod(depth_texture, SCREEN_UV, 0.0).r;
vec4 proximity_view_pos = INV_PROJECTION_MATRIX * vec4(SCREEN_UV * 2.0 - 1.0, proximity_depth_tex, 1.0);
proximity_view_pos.xyz /= proximity_view_pos.w;
ALPHA *= clamp(1.0 - smoothstep(proximity_view_pos.z + proximity_fade_distance, proximity_view_pos.z, VERTEX.z), 0.0, 1.0);
)";
}