make the test scene vaguely more interesting

examples/test/shaders/test.frag

@@ -3,8 +3,8 @@
 #define FOV 24
 
 #define EPSILON 0.01
-#define MAX_STEPS 64
-#define NEAR_D 0.
+#define MAX_STEPS 128
+#define NEAR_D 0.1
 #define FAR_D 120.
 
 #define GRAD_EPSILON 0.0001
@@ -30,8 +30,9 @@ vec3 ray_dir(float fov, vec2 uv) {
 }
 
 SceneResult scene_f(vec3 p) {
-	SceneResult ball = SceneResult(length(p-vec3(0, 2, 0)) - 2, MAT_NORMALS);
-	SceneResult plane = SceneResult(p.y, 2.);
+	SceneResult ball = SceneResult(length(p-vec3(0, 2, 0)) - 2, 3.);
+	SceneResult ball2 = SceneResult(length(p-vec3(2*sin(u_Time), 2-2*cos(u_Time), 0)) - 1, 3.);
+	SceneResult plane = SceneResult(p.y+5, 2.);
 
 	// SceneResult box = SceneResult(
 	// 	fOpUnionRound(fBox(p, vec3(1)), fSphere(p-vec3(.8), 1.), .2), 0.);
@@ -47,7 +48,7 @@ SceneResult scene_f(vec3 p) {
 	// 	fBox(p, vec3(1)),
 	// 	1.);
 
-	SceneResult res = min_sr(ball, plane);
+	SceneResult res = min_sr(min_sr(ball, ball2), plane);
 
 	return res;
 }
@@ -76,6 +77,10 @@ vec3 raymarch(vec3 o, vec3 d, float start, float end) {
 	return vec3(end, N_HIT_FAR_PLANE, MAX_STEPS);
 }
 
+float checker(vec2 uv) {
+	return sign(mod(floor(uv.x) + floor(uv.y), 2.0));
+}
+
 vec4 shade_material(vec3 p, vec3 norm, float mat_idx) {
 	if (mat_idx <= 0.0) {
 		return vec4(0);
@@ -85,8 +90,13 @@ vec4 shade_material(vec3 p, vec3 norm, float mat_idx) {
 		return vec4(norm, 1.0);
 	}
 	if (mat_idx <= 2.0) {
-		return vec4(sign(mod(floor(p.x) + floor(p.z), 2.0)));
+		return vec4(vec3(mix(0.8, 1.0, checker(p.xz))), 1);
 	}
+	if (mat_idx <= 3.0) {
+		return vec4(mix(vec3(0), vec3(0.05, 0, 0.1), dot(vec3(3, 3, 3), norm)), 1);
+	}
+
+	return vec4(1, 0, 0, 1);
 	//return
 }
 
@@ -103,10 +113,10 @@ void main() {
 	vec2 uv = gl_FragCoord.xy * 2.0 / u_Resolution.xy - 1.0;
 	uv.x *= u_Resolution.x/u_Resolution.y;
 
-  float an = 0.3 * u_Time;
-  float d = 6.;
-	vec3 eye = vec3(3. * sin(an), 4., 3. * cos(an)) * d;
-	vec3 target = vec3(0., 0., 0.);
+	float an = 0.;
+	float d = 5.;
+	vec3 eye = vec3(3. * sin(an), 3., 3. * cos(an)) * d;
+	vec3 target = vec3(0., 2., 0.);
 	mat3 lookAt = look_mat(eye, target, 0);
 	vec3 dir = normalize(lookAt * ray_dir(FOV, uv));
 
@@ -117,13 +127,14 @@ void main() {
 	float mat_idx = result.y;
 	float iters = result.z;
 	if (depth >= FAR_D) {
-		color = vec4(.1, .3, .9, 1.);
+	//	color = vec4(.1, .3, .9, 1.);
 		return;
 	}
 
 	//color = colormap(iters/MAX_STEPS+0.5);
 	vec3 p = eye + dir * depth; // recast the ray
 	color = shade(p, mat_idx);
+	//color = vec4(vec3(depth/FAR_D), 1);
 
 	// gamma
   	color = vec4(pow(clamp(color.xyz, 0.0, 1.0), vec3(0.4545)), 1.0);