Fix 3d background clear.

Author: tychedelia

crates/processing_render/src/render/mod.rs

@@ -1314,7 +1314,7 @@ fn create_ndc_background_quad(world_from_clip: Mat4, color: Color, with_uvs: boo
     use bevy::asset::RenderAssetUsages;
     use bevy::mesh::{Indices, PrimitiveTopology};
 
-    let ndc_z = 0.0;
+    let ndc_z = f32::EPSILON;
     let ndc_corners = [
         Vec4::new(-1.0, -1.0, ndc_z, 1.0), // bl
         Vec4::new(1.0, -1.0, ndc_z, 1.0),  // br

examples/box.rs

@@ -31,7 +31,7 @@ fn sketch() -> error::Result<()> {
     transform_set_position(graphics, Vec3::new(100.0, 100.0, 300.0))?;
     transform_look_at(graphics, Vec3::new(0.0, 0.0, 0.0))?;
 
-    let mut angle = 0.0;
+    let mut angle: f32 = 0.0;
 
     while glfw_ctx.poll_events() {
         graphics_begin_draw(graphics)?;