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Tech ENABLE_ALLOW_NEGATIVE_Z -> Shading of sinking instances

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enricoturri1966 2021-04-22 13:18:36 +02:00
parent c8b83ae011
commit 8f385aac44
4 changed files with 67 additions and 12 deletions
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18
resources/shaders/gouraud.fs
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@ -4,7 +4,9 @@ const vec3 ZERO = vec3(0.0, 0.0, 0.0);
const vec3 GREEN = vec3(0.0, 0.7, 0.0);
const vec3 YELLOW = vec3(0.5, 0.7, 0.0);
const vec3 RED = vec3(0.7, 0.0, 0.0);
const vec3 WHITE = vec3(1.0, 1.0, 1.0);
const float EPSILON = 0.0001;
const float BANDS_WIDTH = 10.0;
struct SlopeDetection
{
@ -15,6 +17,7 @@ struct SlopeDetection
uniform vec4 uniform_color;
uniform SlopeDetection slope;
uniform bool sinking;
#ifdef ENABLE_ENVIRONMENT_MAP
uniform sampler2D environment_tex;
@ -23,27 +26,38 @@ uniform SlopeDetection slope;
varying vec3 clipping_planes_dots;
// x = tainted, y = specular;
// x = diffuse, y = specular;
varying vec2 intensity;
varying vec3 delta_box_min;
varying vec3 delta_box_max;
varying vec4 model_pos;
varying float world_pos_z;
varying float world_normal_z;
varying vec3 eye_normal;
vec3 sinking_color(vec3 color)
{
return (mod(model_pos.x + model_pos.y + model_pos.z, BANDS_WIDTH) < (0.5 * BANDS_WIDTH)) ? mix(color, ZERO, 0.6666) : color;
}
void main()
{
if (any(lessThan(clipping_planes_dots, ZERO)))
discard;
vec3 color = uniform_color.rgb;
float alpha = uniform_color.a;
if (slope.actived && world_normal_z < slope.normal_z - EPSILON) {
if (slope.actived && world_normal_z < slope.normal_z - EPSILON)
{
color = vec3(0.7, 0.7, 1.0);
alpha = 1.0;
}
// if the fragment is outside the print volume -> use darker color
color = (any(lessThan(delta_box_min, ZERO)) || any(greaterThan(delta_box_max, ZERO))) ? mix(color, ZERO, 0.3333) : color;
// if the object is sinking, shade it with inclined bands or white around world z = 0
if (sinking)
color = (abs(world_pos_z) < 0.05) ? WHITE : sinking_color(color);
#ifdef ENABLE_ENVIRONMENT_MAP
if (use_environment_tex)
gl_FragColor = vec4(0.45 * texture2D(environment_tex, normalize(eye_normal).xy * 0.5 + 0.5).xyz + 0.8 * color * intensity.x, alpha);