Lowpoly human brain texturing

PT: Criação do mapa de relevo para um modelo de baixa resolução de um cérebro em Blender 2.6X.

EN: Creating the bumpmap for a lowpoly brain model in Blender 2.6X.

Download or click on View Image to see full-size version

PT

1. Modelo de baixo detalhe criado a partir de uma referência encontrada na wikipedia;
2. Pintar os relevos do cérebro no modelo usando a opção de edição Texture Paint na 3D View; 
3. Mapa da textura não organizada(o mapa UV foi feito com o auto-unwrapping, não é recomendável eu é que fui perguiçoso ... :P );
4. Mapa da textura reorganizada (criar uma nova camada de mapeamento UV, criar os seams necessários e unwrap, usar Render > Bake > Texture gerar então a textura reorganizada); Desfocar a textura pouco para suavizar a pintura;
5. Adicionar os modificadores de multires e displace; No displace usar nova textura para deformar a geometria e depois carregar em Apply, isto vai transferir a deformação para o multires;
6. Colocar o preview do multires em zero e ir ao separador Render > Bake > Normals para transferir os normais para uma textura;
7. Mapa da textura de relevo gerada;
8. Previsualização em tempo real do modelo com as texturas criadas.

EN

1. Lowpoly model created from a wikipedia reference;
2. Paint brain relief using Texture Paint editing option in the 3D View;
3. Unsorted texture map (the uvmapping was made with auto-unwrapping because i was too lasy ... :P );
4. Fixed texture map with a new uv layout, the texture was created using the Render > Bake > Texture feature; The texture should be blurred a bit to smooth the painting;
5. Add multires & displace modifiers; On displace modifier use the new texture to displace the geometry, then press on the Apply Button to merge the displace modifier with the multires;
6. Set the preview on Multires to zero and go to Render > Bake > Normals to generate the bumpmap;
7. The generated bumpmap texture;
8. Profit :) !

Sawtooth oscilator

This is a small sawtooth (almost) oscillator circuit which I have been tweaking the last weeks to generate a reasonably decent 100kHz waveform at Vcc=5V. It was based on some random schematic on the web, which didn't generated the output from 0V to Vcc, so I added a few more components and changed a few parts.

Circuit schematic

Assembled circuit

Oscilloscope signal capture

Basically it charges a capacitor (C1) and uses the 555 comparators to trigger the discharge via other PNP transistor(Q2). The triggering voltage is calibrated with the POT_2 and the capacitor fill time is calibrated with the POT_1.

It has a few glitches which didn't appeared on the simulation and neither on the breadboard(parasite capacitances FTW), but I also used some BC560 instead of the BC557.