improve brush jitter

src/brush.cpp

@@ -129,7 +129,7 @@ bool BrushMesh::create()
 StrokeSample Stroke::randomize_sample(const glm::vec3& pos, float pressure, float curve_angle)
 {
     auto rnd_nor = [&] { return float((double)prng() / (double)prng.max()); };              // normalized [0, +1]
-    //auto rnd_neg = [&] { return float((double)prng() / (double)prng.max() * 2.0 - 1.0); };  // normalized [-1, +1]
+    auto rnd_neg = [&] { return float((double)prng() / (double)prng.max() * 2.0 - 1.0); };  // normalized [-1, +1]
     auto rnd_rad = [&] { return float((double)prng() / (double)prng.max() * M_PI * 2.0); }; // normalized [0, 2pi]
     auto rnd_vec = [&] { float rad = rnd_rad(); return glm::vec3(cosf(rad), sinf(rad), 0); };  // normalized direction vector
 
@@ -139,9 +139,9 @@ StrokeSample Stroke::randomize_sample(const glm::vec3& pos, float pressure, floa
 
     StrokeSample s;
     s.origin = pos;
-    s.angle = -curve_angle + (m_brush->m_tip_angle + rnd_nor() * m_brush->m_jitter_angle) * (float)(M_PI * 2.0);
-    s.pos = pos + (rnd_vec() * m_brush->m_jitter_spread * 100.f);
+    s.angle = -curve_angle + (m_brush->m_tip_angle + rnd_neg() * m_brush->m_jitter_angle) * (float)(M_PI * 2.0);
     s.size = 800.f * size * (1.f - rnd_nor() * m_brush->m_jitter_scale) * size_dyn;
+    s.pos = pos + (rnd_vec() * m_brush->m_jitter_spread * s.size);
     s.flow = m_brush->m_tip_flow * (1.f - rnd_nor() * m_brush->m_jitter_flow) * flow_dyn;
     auto hsv = convert_rgb2hsv(m_brush->m_tip_color);
     hsv.x = glm::clamp(glm::mix(hsv.x, (pressure - 0.5f) * 2.0f, m_brush->m_tip_hue * (float)m_brush->m_tip_hue_pressure) + (rnd_nor() - 0.5f) * m_brush->m_jitter_hue, 0.f, 1.f);

src/node_panel_stroke.cpp

@@ -151,8 +151,8 @@ void NodePanelStroke::init_controls()
             if (on_brush_changed)
                 on_brush_changed(this, m_brush_popup->get_texture_path(index), m_brush_popup->get_thumb_path(index));
             m_brush_thumb->set_image(m_brush_popup->get_thumb_path(index));
-            m_brush_popup->mouse_release();
-            m_brush_popup->parent->remove_child(m_brush_popup.get());
+            //m_brush_popup->mouse_release();
+            //m_brush_popup->parent->remove_child(m_brush_popup.get());
         };
     };
 
@@ -209,6 +209,7 @@ void NodePanelStroke::init_controls()
         });
     };
 
+    update_controls();
 }
 
 void NodePanelStroke::init_slider(NodeSliderH*& target, const char* id, float Brush::* prop)