Added initial position (far away) in the g-Buffer position. (#1360)

* Added initial position (far away) in the g-Buffer position.
* Fixed bug with Sun's star and atmosphere.

data/assets/scene/digitaluniverse/stars.asset

@@ -66,7 +66,8 @@ local sunstar = {
         MagnitudeExponent = 6.2,
         SizeComposition = "Distance Modulus",
         RenderMethod = "Texture Based", -- or PSF
-        FadeInDistances = { 0.0001, 0.1 }
+        FadeInDistances = { 0.0001, 0.1 },
+        RenderableType = "PostDeferredTransparent"
     },
     GUI = {
         Name = "Sun",

modules/space/shaders/star_fs.glsl

@@ -101,7 +101,7 @@ Fragment getFragment() {
     vec4 fullColor = vec4(color.rgb, textureColor.a);
     fullColor.a *= alphaValue;
     
-    if (fullColor.a == 0) {
+    if (fullColor.a < 0.001) {
         discard;
     }
 

src/rendering/framebufferrenderer.cpp

@@ -73,6 +73,7 @@ namespace {
         }
     };
 
+    constexpr const glm::vec4 PosBufferClearVal = { 1e32, 1e32, 1e32, 1.f };
 
     constexpr const std::array<const char*, 7> HDRUniformNames = {
         "hdrFeedingTexture", "blackoutFactor", "hdrExposure", "gamma",
@@ -1170,6 +1171,7 @@ void FramebufferRenderer::render(Scene* scene, Camera* camera, float blackoutFac
         glBindFramebuffer(GL_FRAMEBUFFER, _gBuffers.framebuffer);
         glDrawBuffers(3, ColorAttachmentArray);
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+        glClearBufferfv(GL_COLOR, 1, glm::value_ptr(PosBufferClearVal));
     }
     Time time = global::timeManager->time();