diff --git a/engine/canvas.cpp b/engine/canvas.cpp
index 532b479..afb3bc4 100644
--- a/engine/canvas.cpp
+++ b/engine/canvas.cpp
@@ -1123,7 +1123,6 @@ void ui::Canvas::export_anim(std::string data_path)
 
     // prepare common states
     glViewport(0, 0, m_width, m_height);
-    glEnable(GL_BLEND);
 
     RTT m_latlong;
     m_latlong.create(m_width * 4, m_height * 2); // NOTE: w and h must be equal to make sense
@@ -1141,18 +1140,29 @@ void ui::Canvas::export_anim(std::string data_path)
         GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, // top
         GL_TEXTURE_CUBE_MAP_POSITIVE_Y, // bottom
     };
+
+    int seq = 0;
     for (auto layer_index : m_order)
     {
         glViewport(0, 0, m_width, m_height);
         for (int i = 0; i < 6; i++)
         {
             m_tmp[i].bindFramebuffer();
-            m_tmp[i].clear({ 1, 1, 1, 1 });
-            
-            ui::ShaderManager::use(kShader::Checkerboard);
-            ui::ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
-            m_plane.draw_fill();
             
+            if (seq == 0)
+            {
+                m_tmp[i].clear({ 1, 1, 1, 1 });
+                ui::ShaderManager::use(kShader::Checkerboard);
+                ui::ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
+                m_plane.draw_fill();
+                glEnable(GL_BLEND);
+            }
+            else
+            {
+                m_tmp[i].clear({ 1, 1, 1, 0 });
+                glDisable(GL_BLEND);
+            }
+
             glActiveTexture(GL_TEXTURE0);
             ShaderManager::use(ui::kShader::TextureAlpha);
             ShaderManager::u_float(kShaderUniform::Alpha, 1);
@@ -1174,29 +1184,32 @@ void ui::Canvas::export_anim(std::string data_path)
             m_tmp[i].unbindFramebuffer();
         }
 
+
         glViewport(0, 0, m_latlong.getWidth(), m_latlong.getHeight());
         glActiveTexture(GL_TEXTURE0);
         m_latlong.bindFramebuffer();
-        m_latlong.clear({ 1, 1, 1, 1 });
+        m_latlong.clear({ 1, 1, 1, 0 });
         ui::ShaderManager::use(kShader::Equirect);
         ui::ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
         ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
         glBindTexture(GL_TEXTURE_CUBE_MAP, cube_id);
-        m_sampler.bind(0);
+        glDisable(GL_BLEND);
+        m_sampler_mask.bind(0);
         m_plane.draw_fill();
-        m_sampler.unbind();
+        m_sampler_mask.unbind();
         glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
         m_latlong.unbindFramebuffer();
         {
             auto latlong_data = std::make_unique<uint8_t[]>(m_latlong.bytes());
             m_latlong.readTextureData(latlong_data.get());
             static char name[128];
-            sprintf(name, "%s/latlong-frame%02d.jpg", data_path.c_str(), layer_index);
+            sprintf(name, "%s/latlong-frame%02d.png", data_path.c_str(), seq);
+            seq++;
             LOG("writing %s", name);
-            //int ret = stbi_write_png(name, m_latlong.getWidth(), m_latlong.getHeight(), 4, latlong_data.get(), m_latlong.stride());
-            jpge::params params;
-            params.m_quality = 100;
-            bool saved = jpge::compress_image_to_jpeg_file(name, m_latlong.getWidth(), m_latlong.getHeight(), 4, latlong_data.get(), params);
+            int ret = stbi_write_png(name, m_latlong.getWidth(), m_latlong.getHeight(), 4, latlong_data.get(), m_latlong.stride());
+            //jpge::params params;
+            //params.m_quality = 100;
+            //bool saved = jpge::compress_image_to_jpeg_file(name, m_latlong.getWidth(), m_latlong.getHeight(), 4, latlong_data.get(), params);
         }
     }