create bubbles with good rotation

grafika_projekt/shaders/bubble.frag

@@ -3,11 +3,24 @@
 
 in vec3 fragPos;
 in vec3 interpNormal;
+in float v_fresnel;
 uniform vec3 cameraPos;
-uniform samplerCube skybox;
+in vec3 incident;
+uniform samplerCube bubble;
 layout (binding = 0) uniform samplerCube tex_map;
 void main()
 {   
+    float ratio = 1.33 / 1.00;
+    vec3 I = normalize(fragPos - cameraPos);
+    vec3 R = refract(I, normalize(interpNormal), ratio);
+
     vec3 r = reflect(normalize(-fragPos), normalize(interpNormal));
-    gl_FragColor = texture(tex_map, r);
+    
+
+    vec4 reflectionColor = texture( tex_map, r );
+    vec4 refractionColor = texture( tex_map, R );
+
+     
+
+    gl_FragColor = vec4(mix( reflectionColor,refractionColor,0  ).rgba);
 }

grafika_projekt/shaders/bubble.vert

@@ -5,12 +5,33 @@ layout(location = 1) in vec3 vertexNormal;
 out vec3 interpNormal;
 out vec3 fragPos;
 out vec3 TexCoords;
+out vec3 incident;
+out float v_fresnel;
+uniform vec3 viewPos;
+
+
+// Indices of refraction
+const float Air = 1.0;
+const float Glass = 4; //1.51714;//4
+
+// Air to glass ratio of the indices of refraction (Eta)
+const float Eta = Air / Glass;
+
+// see http://en.wikipedia.org/wiki/Refractive_index Reflectivity
+const float R0 = ((Air - Glass) * (Air - Glass)) / ((Air + Glass) * (Air + Glass));
+
+
 
 uniform mat4 modelMatrix;
 uniform mat4 modelViewProjectionMatrix;
 layout (binding = 0) uniform samplerCube tex_map;
 void main()
 {
+
+	vec4 vertex = modelMatrix * vec4( vertexPosition, 1.0 );
+	vec4 camera = vec4( viewPos, 1.0 );
+	incident = normalize( vec3( vertex - camera ) );
+	v_fresnel = R0 + (1.0 - R0) * pow( (1.0 - dot( -incident, vertexNormal ) ), 5.0);
 	interpNormal = mat3(transpose(inverse(modelMatrix))) * vertexNormal;
 	fragPos = (modelMatrix * vec4(vertexPosition, 1.0)).xyz;
 	gl_Position = modelViewProjectionMatrix * vec4(vertexPosition, 1.0);

grafika_projekt/src/main.cpp

@@ -379,7 +379,7 @@ void renderScene()
 	glm::mat4 bubbleInitialTransformation = glm::translate(glm::vec3(0, -0.5, -0.4)) * glm::rotate(glm::radians(180.0f), glm::vec3(0, 1, 0)) * glm::scale(glm::vec3(0.5f));
 
 
-	drawObjectTexture(bubbleContext, bubbleInitialTransformation, cubemapTexture, cubeProgram);
+	//drawObjectTexture(bubbleContext, bubbleInitialTransformation, cubemapTexture, cubeProgram);
 
 	
 	glm::vec3 change1 = glm::vec3(0, 3, 0);
@@ -396,9 +396,9 @@ void renderScene()
 			drawObjectTexture(fishContext, animationMatrix(time + 15, change2, fishKeyPoints, glm::vec3(0.25f), 1.f), textureFish, programTexture);
 			drawObjectTexture(fishContext, animationMatrix(time + 15, change3, fishKeyPoints, glm::vec3(0.25f), 1.f), textureFish, programTexture);
 			drawObjectTexture(fishContext, animationMatrix(time + 15, change4, fishKeyPoints, glm::vec3(0.25f), 1.f), textureFish, programTexture);
-			drawObjectTexture(bubbleContext, animationMatrix(time + 15, change5, bubbleKeyPoints, glm::vec3(0.1f), 0.2f), cubemapTexture, cubeProgram);
-			//drawObjectTexture(bubbleContext, animationMatrix(time + 15, change6, bubbleKeyPoints, glm::vec3(0.01f), 0.2f), GL_TEXTURE_CUBE_MAP, skyboxProgram);
-			//drawObjectTexture(bubbleContext, animationMatrix(time + 15, change7, bubbleKeyPoints, glm::vec3(0.01f), 0.2f), GL_TEXTURE_CUBE_MAP, skyboxProgram);
+			drawObjectTexture(bubbleContext, animationMatrix(time + 15, change5, bubbleKeyPoints, glm::vec3(0.01f), 0.2f), cubemapTexture, cubeProgram);
+			drawObjectTexture(bubbleContext, animationMatrix(time + 15, change6, bubbleKeyPoints, glm::vec3(0.01f), 0.2f), cubemapTexture, cubeProgram);
+			drawObjectTexture(bubbleContext, animationMatrix(time + 15, change7, bubbleKeyPoints, glm::vec3(0.01f), 0.2f), cubemapTexture, cubeProgram);
 			time -= 6;
 		}
 	}