Object Mode: Make point clouds a bit less like uniform blobs

Also this display is optimized. It does not use blending and pixel discard.
Working with scanned data should be more pleasant with this.

A better option would be to use gl_FragDepth to have a better sense of
volume but this discards early depth test.

1 files changed, 19 insertions, 0 deletions

diff --git a/source/blender/draw/modes/shaders/object_loose_points_frag.glsl b/source/blender/draw/modes/shaders/object_loose_points_frag.glsl
new file mode 100644
index 00000000000..66b3091a41c
--- /dev/null
+++ b/source/blender/draw/modes/shaders/object_loose_points_frag.glsl
@@ -0,0 +1,19 @@
+
+uniform vec4 color;
+uniform vec4 innerColor;
+
+out vec4 fragColor;
+
+void main()
+{
+	vec2 centered = abs(gl_PointCoord - vec2(0.5));
+	float dist = max(centered.x, centered.y);
+
+	float fac = dist * dist * 4.0;
+	fragColor = mix(innerColor, color, 0.45 + fac * 0.65);
+
+	/* Make the effect more like a fresnel by offsetting
+	 * the depth and creating mini-spheres.
+	 * Disabled as it has performance impact. */
+	// gl_FragDepth = gl_FragCoord.z + 1e-6 * fac;
+}