Correct normal bias for entities

Remove use of magic constants.
Apply cameraOffset
Calculate distance projected on SM plane

client/shaders/object_shader/opengl_vertex.glsl

@@ -3,6 +3,7 @@ uniform vec3 dayLight;
 uniform vec3 eyePosition;
 uniform float animationTimer;
 uniform vec4 emissiveColor;
+uniform vec3 cameraOffset;
 
 
 varying vec3 vNormal;
@@ -110,10 +111,13 @@ void main(void)
 	// Calculate normal offset scale based on the texel size adjusted for 
 	// curvature of the SM texture. This code must be change together with
 	// getPerspectiveFactor or any light-space transformation.
-	float distanceToPlayer = length((eyePosition - worldPosition).xyz) / f_shadowfar;
+	vec3 eyeToVertex = worldPosition - eyePosition + cameraOffset;
+	// Distance from the vertex to the player
+	float distanceToPlayer = length(eyeToVertex - v_LightDirection * dot(eyeToVertex, v_LightDirection)) / f_shadowfar;
+	// perspective factor estimation according to the 
 	float perspectiveFactor = distanceToPlayer * bias0 + bias1;
-	float texelSize = 1.0 / f_textureresolution;
-	texelSize *= f_shadowfar * perspectiveFactor / (bias1 / perspectiveFactor - texelSize * bias0) * 0.15;
+	float texelSize = f_shadowfar * perspectiveFactor * perspectiveFactor /
+			(f_textureresolution * bias1  - perspectiveFactor * bias0);
 	float slopeScale = clamp(pow(1.0 - cosLight*cosLight, 0.5), 0.0, 1.0);
 	normalOffsetScale = texelSize * slopeScale;
 	

src/client/shadows/dynamicshadows.cpp

@@ -58,15 +58,13 @@ void DirectionalLight::createSplitMatrices(const Camera *cam)
 	const v3f &viewUp = cam->getCameraNode()->getUpVector();
 	v3f viewRight = look.crossProduct(viewUp);
 
-	v3f farCorner = look + viewRight * tanFovX + viewUp * tanFovY;
+	v3f farCorner = (look + viewRight * tanFovX + viewUp * tanFovY).normalize();
 	// Compute the frustumBoundingSphere radius
 	v3f boundVec = (camPos + farCorner * sfFar) - newCenter;
-	radius = boundVec.getLength() * 2.0f;
+	radius = boundVec.getLength();
 	// boundVec.getLength();
-	float vvolume = radius * 2.0f;
-
+	float vvolume = radius;
 	v3f frustumCenter = newCenter;
-	// probar radius multipliacdor en funcion del I, a menor I mas multiplicador
 	v3f eye_displacement = direction * vvolume;
 
 	// we must compute the viewmat with the position - the camera offset

src/client/shadows/dynamicshadows.h

@@ -22,6 +22,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "irrlichttypes_bloated.h"
 #include <matrix4.h>
 #include "util/basic_macros.h"
+#include "constants.h"
 
 class Camera;
 class Client;
@@ -67,7 +68,7 @@ public:
 	/// Gets the light's far value.
 	f32 getMaxFarValue() const
 	{
-		return farPlane;
+		return farPlane * BS;
 	}
 
 

src/client/shadows/dynamicshadowsrender.cpp

@@ -118,12 +118,8 @@ size_t ShadowRenderer::getDirectionalLightCount() const
 f32 ShadowRenderer::getMaxShadowFar() const
 {
 	if (!m_light_list.empty()) {
-		float wanted_range = m_client->getEnv().getClientMap().getWantedRange();
-
-		float zMax = m_light_list[0].getMaxFarValue() > wanted_range
-					     ? wanted_range
-					     : m_light_list[0].getMaxFarValue();
-		return zMax * MAP_BLOCKSIZE;
+		float zMax = m_light_list[0].getMaxFarValue();
+		return zMax;
 	}
 	return 0.0f;
 }