diff --git a/data/shaders/instanced_object_pass.vert b/data/shaders/instanced_object_pass.vert
index c4bda0da9..daa2a8cb0 100644
--- a/data/shaders/instanced_object_pass.vert
+++ b/data/shaders/instanced_object_pass.vert
@@ -50,9 +50,11 @@ void main(void)
     mat4 ModelMatrix = getWorldMatrix(Origin, Orientation, Scale);
     mat4 TransposeInverseModelView = transpose(getInverseWorldMatrix(Origin, Orientation, Scale) * InverseViewMatrix);
     gl_Position = ProjectionViewMatrix *  ModelMatrix * vec4(Position, 1.);
+    // Keep orthogonality
     nor = (TransposeInverseModelView * vec4(Normal, 0.)).xyz;
-    tangent = (TransposeInverseModelView * vec4(Tangent, 0.)).xyz;
-    bitangent = (TransposeInverseModelView * vec4(Bitangent, 0.)).xyz;
+    // Keep direction
+    tangent = (ViewMatrix * ModelMatrix * vec4(Tangent, 0.)).xyz;
+    bitangent = (ViewMatrix * ModelMatrix * vec4(Bitangent, 0.)).xyz;
     uv = Texcoord;
     uv_bis = SecondTexcoord;
     color = Color.zyxw;
diff --git a/data/shaders/object_pass.vert b/data/shaders/object_pass.vert
index 01997d854..130874299 100644
--- a/data/shaders/object_pass.vert
+++ b/data/shaders/object_pass.vert
@@ -47,9 +47,11 @@ void main(void)
     mat4 ModelViewProjectionMatrix = ProjectionMatrix * ViewMatrix * ModelMatrix;
     mat4 TransposeInverseModelView = transpose(InverseModelMatrix * InverseViewMatrix);
     gl_Position = ModelViewProjectionMatrix * vec4(Position, 1.);
+    // Keep orthogonality
     nor = (TransposeInverseModelView * vec4(Normal, 0.)).xyz;
-    tangent = (TransposeInverseModelView * vec4(Tangent, 0.)).xyz;
-    bitangent = (TransposeInverseModelView * vec4(Bitangent, 0.)).xyz;
+    // Keep direction
+    tangent = (ViewMatrix * ModelMatrix * vec4(Tangent, 0.)).xyz;
+    bitangent = (ViewMatrix * ModelMatrix * vec4(Bitangent, 0.)).xyz;
     uv = (TextureMatrix * vec4(Texcoord, 1., 1.)).xy;
     uv_bis = SecondTexcoord;
 }
diff --git a/data/shaders/ssao.frag b/data/shaders/ssao.frag
index a66d8b462..3ca43d588 100644
--- a/data/shaders/ssao.frag
+++ b/data/shaders/ssao.frag
@@ -2,7 +2,7 @@
 // and improvements here http://graphics.cs.williams.edu/papers/SAOHPG12/
 
 uniform sampler2D dtex;
-uniform float radius = 1.;
+uniform float radius;
 uniform float k = 1.5;
 uniform float sigma = 1.;
 out float AO;
@@ -38,7 +38,7 @@ void main(void)
     float r = radius / FragPos.z;
     float phi = 3. * (x ^ y) + x * y;
     float bl = 0.0;
-    float m = max(log2(r) + 6 + log2(invSamples), 0.);
+    float m = log2(r) + 6 + log2(invSamples);
 
     float theta = 2. * 3.14 * tau * .5 * invSamples + phi;
     vec2 rotations = vec2(cos(theta), sin(theta)) * screen;
@@ -48,14 +48,14 @@ void main(void)
         float alpha = (i + .5) * invSamples;
         rotations = vec2(rotations.x * offset.x - rotations.y * offset.y, rotations.x * offset.y + rotations.y * offset.x);
         float h = r * alpha;
-        vec2 offset = h * rotations;
+        vec2 localoffset = h * rotations;
 
         m = m + .5;
-        ivec2 ioccluder_uv = ivec2(x, y) + ivec2(offset);
+        ivec2 ioccluder_uv = ivec2(x, y) + ivec2(localoffset);
 
         if (ioccluder_uv.x < 0 || ioccluder_uv.x > screen.x || ioccluder_uv.y < 0 || ioccluder_uv.y > screen.y) continue;
 
-        float LinearoccluderFragmentDepth = textureLod(dtex, vec2(ioccluder_uv) / screen, m).x;
+        float LinearoccluderFragmentDepth = textureLod(dtex, vec2(ioccluder_uv) / screen, max(m, 0.)).x;
         vec3 OccluderPos = getXcYcZc(ioccluder_uv.x, ioccluder_uv.y, LinearoccluderFragmentDepth);
 
         vec3 vi = OccluderPos - FragPos;
diff --git a/src/graphics/irr_driver.cpp b/src/graphics/irr_driver.cpp
index db0931df2..e786c7725 100644
--- a/src/graphics/irr_driver.cpp
+++ b/src/graphics/irr_driver.cpp
@@ -481,6 +481,15 @@ void IrrDriver::initDevice()
     CVS->init();
 
 
+    if (UserConfigParams::m_shadows_resolution != 0 &&
+        (UserConfigParams::m_shadows_resolution < 512 ||
+         UserConfigParams::m_shadows_resolution > 2048))
+    {
+        Log::warn("IrrDriver", "Invalid value for UserConfigParams::m_shadows_resolution : %i",
+            (int)UserConfigParams::m_shadows_resolution);
+        UserConfigParams::m_shadows_resolution = 0;
+    }
+
     // This remaps the window, so it has to be done before the clear to avoid flicker
     m_device->setResizable(false);
 
diff --git a/src/states_screens/options_screen_video.cpp b/src/states_screens/options_screen_video.cpp
index d3415d180..f7b1950fe 100644
--- a/src/states_screens/options_screen_video.cpp
+++ b/src/states_screens/options_screen_video.cpp
@@ -95,7 +95,7 @@ static GFXPreset GFX_PRESETS[] =
     },
 
     {
-        true /* light */, 2 /* shadow */, true /* bloom */, true /* motionblur */,
+        true /* light */, 1024 /* shadow */, true /* bloom */, true /* motionblur */,
         true /* lightshaft */, true /* glow */, true /* mlaa */, true /* ssao */, true /* weather */,
         true /* animatedScenery */, 2 /* animatedCharacters */, 16 /* anisotropy */,
         true /* depth of field */, true /* global illumination */
@@ -442,9 +442,11 @@ void OptionsScreenVideo::updateTooltip()
     tooltip = tooltip + L"\n" + _("Ambient occlusion : %s",
         UserConfigParams::m_ssao ? enabled : disabled);
     //I18N: in graphical options
-    tooltip = tooltip + L"\n" + _("Shadows: %s",
-        UserConfigParams::m_shadows_resolution == 1 ? "low" : UserConfigParams::m_shadows_resolution == 2 ?
-                                    "high" : disabled);
+    if (UserConfigParams::m_shadows_resolution == 0)
+        tooltip = tooltip + L"\n" + _("Shadows: %s", disabled);
+    else
+        tooltip = tooltip + L"\n" + _("Shadows: %i", UserConfigParams::m_shadows_resolution);
+
     //I18N: in graphical options
     tooltip = tooltip + L"\n" + _("Bloom : %s",
         UserConfigParams::m_bloom ? enabled : disabled);